Pregnant Princess Kate stuns in lace dress at gala
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WATCH: Kate, 35, who is expecting her third child, said of motherhood, "It takes a whole community to help raise a child."

Princess Kate hosted a charity gala Tuesday at Kensington Palace to benefit a mental health charity for which she serves as royal patron.

Kate, 35, who is expecting her third child in April, showed her baby bump in a stunning floor-length, black lace gown by designer Diane von Furstenberg.

Catherine, Duchess of Cambridge, arrives at the Jaguar Land Rover's Solihull manufacturing plant, the first stop of the start of their visit to Birmingham, England, Nov. 22, 2017. Photo Credit: Robin Nunn/Nunn Syndication/Polaris
Britain's Catherine, Duchess of Cambridge, drives a Land Rover Discovery as she takes part in an off-road driving experience during her visit to Jaguar Land Rover's Solihull manufacturing plant in Birmingham, E... Photo Credit: Paul Ellis/AFP/Getty Images
Catherine, Duchess of Cambridge dances with Paddington Bear at Paddington Station while meeting the cast and crew from the forthcoming film Paddington 2, in London, Oct. 16, 2017. Pregnant with her third child,... Photo Credit: Jonathan Brady/WPA Pool via Getty Images
Britain's Prince William, Duke of Cambridge, Catherine Duchess of Cambridge and Prince Harry celebrate World Mental Health Day at Buckingham Palace in London, Oct. 10, 2017. Photo Credit: Heathcliff O'Malley/Reuters
Britain's Prince William and Kate, the Duchess of Cambridge, share a laugh with Andreas Goebes, right, of the bakers guild Heidelberg as they form pastry to pretzels during a visit at the market in the historic... Photo Credit: Thomas Kienzle/AP
Britain's Prince William, right, and his wife Kate, the Duchess of Cambridge, left, arrive at German Cancer Research Center in Heidelberg, Germany, July 20, 2017. Photo Credit: Marijan Murat/dpa/AP
The Duchess of Cambridge watches Andy Murray beat Alexander Bublik on Day one of the 2017 Wimbledon Tennis Championships, July 3, 2017, London. Photo Credit: Andrew Parsons/i-Images/Polaris
Catherine, Duchess of Cambridge, Patron of the All England Lawn Tennis and Croquet Club (AELTC) on day one of the Wimbledon Championships at The All England Lawn Tennis and Croquet Club, Wimbledon, on July 3, 2... Photo Credit: Gareth Fuller/WPA Pool/Getty Images
Sophie, Countess of Wessex, loses her balance and falls on to Catherine, Duchess of Cambridge, as the carriages pull away ahead of the first day of the Royal Ascot 2017, June 20, 2017, in Ascot, England. Photo Credit: Jason Dawson/Nunn Syndication/Polaris
Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Queen Elizabeth II, Princess Anne, Princess Royal, Prince Phillip, Duke of Edinburgh and Princess Beatrice attend a garden party at Buckingham... Photo Credit: Victoria Jones/WPA Pool/Getty Images
Catherine, Duchess of Cambridge departs the Grand Duke Jean Museum of Modern Art where she viewed exhibitions by British artists Sir Tony Cragg and Darren Almond, May 11, 2017, in Luxembourg. Photo Credit: Samir Hussein/WireImage via Getty Images
A young boy reacts after he is handed a bouquet of flowers to Britain's Catherine, the Duchess of Cambridge in Luxembourg, May 11, 2017. Photo Credit: Toby Melville/Reuters
Catherine, Duchess of Cambridge feeds a lamb as she visits "Farms for City Children" at Wick Court farm in Arlingham, Gloucester, May 3, 2017. She visited to see the charity work giving young people f... Photo Credit: Neil Munns/EPA
Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend the official opening of The Global Academy in support of Heads Together, April 20, 2017, in Hayes, England. Photo Credit: Max Mumby/Indigo/Getty Images
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend Easter Sunday service at Windsor Castle in Windsor, England, April 16, 2017. Photo Credit: Alan Davidson/SilverHub/REX/Shutterstock
Catherine, Duchess of Cambridge, is presented with tap shoes during the Opening Night Royal Gala performance of "42nd Street" in aid of the East Anglia Children's Hospice at the Theatre Royal Drury La... Photo Credit: Dave Benett/Getty Images
Catherine, Duchess of Cambridge, arrives at the 2017 Portrait Gala at the National Portrait Gallery in London, March 28, 2017. Photo Credit: Stephen Lock/i-Images/Polaris
Catherine, Duchess of Cambridge, at Cavalry Barracks, Hounslow, during the Irish Guards St. Patrick's Day Parade, in London, March 17, 2017. Photo Credit: Rupert Hartley/REX/Shutterstock
Catherine, Duchess of Cambridge visits the Ronald McDonald House Evelina London, Feb. 28, 2017, in London. Photo Credit: Danny Martindale/WireImage/Getty Images
Catherine, Duchess of Cambridge visits MIST, a child and adolescent mental health project, Feb. 22, 2017 in Pontypool, Wales. Photo Credit: WireImage
Britain's Prince William, Duke of Cambridge (R) and Britain's Catherine, Duchess of Cambridge arrive to attend the BAFTA British Academy Film Awards at the Royal Albert Hall in London, Feb. 12, 2017.

Photo Credit: Daniel Leal-Olivas/AFP/Getty Images

Catherine, Duchess of Cambridge arrives for a visit to the CBUK Stratford, Jan. 11, 2017, in London, England. Photo Credit: Mark Cuthbert/UK Pres via Getty Images
Prince William, the Duke of Cambridge (R), his wife Catherine, The Duchess of Cambridge (L), Prince George (2nd R) and Princess Charlotte arrive to attend the morning Christmas Day service at St Mark's Church i... Photo Credit: Andrew Matthews/Pool/Reuters
Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive to attend a Christmas party for volunteers at The Mix youth service, Dec. 19, 2016, in London, England. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge reads the Scouts promise during a Cub Scout Pack meeting with cubs in Kings Lynn, England, to celebrate 100 years of Cubs. Photo Credit: Ben Stansall/WPA Rota/Nunn Syndication/Polaris
Catherine, The Duchess of Cambridge, attend's a special Cub Scout Pack meeting with Cubs from the Kings Lynn District to celebrate 100 years of Cubs. Photo Credit: i-Images, PacificCoastNews
Kate, the Duchess of Cambridge arrives for a children's tea party at the Natural History Museum to celebrate Dippy the Diplodocus, who has stood in Hintze Hall for over a century, in London, Nov. 22, 2016. Photo Credit: Yui Mok/AP Photo
The Duchess of Cambridge attends the Remembrance Sunday service at The Cenotaph in London, Nov. 13, 2016. Photo Credit: Stephen Lock/i-Images / Polaris
Britain's Duchess of Cambridge waves as she leaves after a visit to the Nelson Trust Women's Center in Gloucester, England, Nov. 4, 2016. Photo Credit: Richard Pohler/Pool/AFP/Getty Images
Britain's Kate, the Duchess of Cambridge, arrives at Working Titles Office to see "A Street Cat Named Bob" in London, Nov. 3, 2016. The Duchess is attending in aid of Patron of Action on Addiction. Photo Credit: Alastair Grant/AP Photo
Catherine Duchess of Cambridge is seen at The National Football Museum in Manchester, Oct. 14, 2016. Photo Credit: Tim Rooke/REX/Shutterstock
Catherine, Duchess of Cambridge visits Bouwkeet, the social Makerspace of Bospolder-Tussendijken on Oct. 11, 2016 in The Hague, Netherlands. Photo Credit: Samir Hussein/Getty Images
Kate, the Duchess of Cambridge, is greeted by Dutch King Willem-Alexander upon her arrival in The Hague, Netherlands, Oct. 11, 2016. Photo Credit: Peter Dejong/AP Photo
Catherine Duchess of Cambridge celebrates World Mental Health Day with a special Heads Together event at County Hall and The London Eye on the Southbank, London, Oct. 10, 2016. Photo Credit: Tim Rooke/REX/Shutterstock
Catherine, Duchess of Cambridge arrives by Sea Plane in Vancouver, Sept. 25, 2016 in Vancouver, Canada. Photo Credit: Samir Hussein/Getty Images
Catherine, Duchess of Cambridge leaves Stewards Academy, Sept. 16, 2016, in Harlow, England. Photo Credit: Getty Images
Catherine, Duchess of Cambridge is seen at Tresco Abbey Gardens during a visit to Cornwall, Sept. 2, 2016, in Tresco, England. Photo Credit: GC Images/Getty Images
Britain's Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, begin their visit to Cornwall in Truro, Sept. 1, 2016. Photo Credit: FameFlynetUK/FameFlynet Pictures
Catherine, Duchess of Cambridge is seen during a visit to the YoungMinds mental health charity helpline, partner of the Heads Together mental health charity, Aug. 25, 2016, in London. Photo Credit: Danny Martindale/WireImage/Getty Images
The Duke and Duchess of Cambridge arrive at Bute Mills in Luton, where they will tour the facilities of national charity Youthscape. Photo Credit: PA Wire/Press Association Images
Catherine, Duchess of Cambridge visits Land Rover BAR boat shed at the America's Cup World Series, July 24, 2016, in Portsmouth, England. Photo Credit: Henry Browne/Getty Images
Catherine, Duchess of Cambridge attends the Men's Final of the Wimbledon Tennis Championships between Milos Raonic and Andy Murray at Wimbledon, July 10, 2016, in London. Photo Credit: Karwai Tang/WireImage
Catherine, Duchess of Cambridge and Prince George of Cambridge attend the The Royal International Air Tattoo at RAF Fairford, July 8, 2016, in Fairford, England. Photo Credit: Samir Hussein/WireImage
Catherine, Duchess of Cambridge, stands in the royal box watching the ladies semifinals at Wimbledon Tennis Championships in London, July 7, 2016. Photo Credit: Andrew Parsons/Polaris
Catherine, Duchess of Cambridge arrives to present the Art Fund Museum of the Year 2016 prize at a dinner hosted at the Natural History Museum, July 6, 2016, in London. Photo Credit: Getty Images
Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, take part in a vigil at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations and view the batt... Photo Credit: Splash News
Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, take part in a vigil at Thiepval Memorial to the Missing of the Somme during Somme Centenary Commemorations and view the batt... Photo Credit: Splash News
Catherine, Duchess of Cambridge attends a gala dinner in support of East Anglia's Children's Hospices' nook appeal at Houghton Hall, June 22, 2016, in King's Lynn, England. Photo Credit: Stephen Pond/Getty Images
Britain's Kate Duchess of Cambridge signs a book of condolence for the Orlando nightclub shooting victims at the US Embassy in London, while Prince William looks on, June 14, 2016. Photo Credit: Philip Toscano/AP Photo
(L-R) Prince Charles, Prince of Wales, Catherine, Duchess of Cambridge, Princess Charlotte, Prince George, Prince William, Duke of Cambridge, Prince Harry, Queen Elizabeth II and Prince Philip, Duke of Edinburg... Photo Credit: Ben A. Pruchnie/Getty Images
Catherine, Duchess of Cambridge attends a lunch after the National Service of Thanksgiving as part of the 90th birthday celebrations for The Queen at The Guildhall on June 10, 2016 in London. Photo Credit: Jeff Spicer/Getty Images
Duchess Kate attends SportsAid's 40th anniversary dinner in London, June 9, 2016. On arrival, The Duchess will met SportsAid ambassadors and young athletes who will be competing in the Rio 2016 Olympics at a pr... Photo Credit: Eddie Mulholland-WPA Pool/Getty Images
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive to greet guests attending a garden party at Buckingham Palace, May 24, 2016, in London. Photo Credit: Dan Kitwood/WPA Pool/Getty Images
Catherine, Duchess of Cambridge attends Chelsea Flower Show press day at Royal Hospital Chelsea, May 23, 2016 in London. Photo Credit: Mark Cuthbert/UK Press via Getty Images
Catherine, Duchess of Cambridge, patron of the 1851 Trust, arrives at Land Rover BAR, May 20, 2016 in Portsmouth, England. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge joins the Land Rover BAR team on board their training boat, as they run a training circuit on the Solent, May 20, 2016, in Portsmouth, England. Photo Credit: Mark Cuthbert/UK Press via Getty Images
Catherine, Duchess of Cambridge joins the Land Rover BAR team on board their training boat, as they run a training circuit on the Solent, May 20, 2016, in Portsmouth, England. Photo Credit: Mark Cuthbert/UK Press via Getty Images
Prince William and Catherine, Duke and Duchess of Cambridge, and Prince Harry attend the launch of their Heads Together campaign to eliminate stigma on mental health at the Queen Elizabeth Olympic Park in Londo... Photo Credit: Robin Nunn/Nunn Syndication/Polaris
Catherine, Duchess of Cambridge is seen leaving the "Vogue 100: A Century Of Style" exhibition at National Portrait Gallery, May 4, 2016, in London. Photo Credit: Danny Martindale/WireImage/Getty Images
Catherine Duchess of Cambridge plays during a visit to meet children from Magic Bus, Childline and Doorstep, three non-governmental organizations, at Mumbai's iconic recreation ground, the Oval Maidan, during t... Photo Credit: Tim Rooke/REX/Shutterstock
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive for a Bollywood Inspired Charity Gala at the Taj Mahal Palace Hotel during the royal visit to India and Bhutan on April 10, 2016 in M... Photo Credit: Samir Hussein/Getty images
Prince William, Duke of Cambridge and Princess Catherine, Duchess of Cambridge attend a reception ahead of their tour of India and Bhutan at Kensington Palace, April 6, 2016, in London. Photo Credit: WPA Pool/Getty Images
Catherine, Duchess of Cambridge opens the new EACH Charity Shop, March 18, 2016, in Holt, Norfolk. Photo Credit: Mark Cuthbert/UK Press via Getty Images
Britain's Prince William, Duke of Cambridge, his wife Catherine, Duchess of Cambridge, and Prince Harry arrive to attend a Commonwealth Service at Westminster Abbey in central London, March 14, 2016.

Queen Eli... Photo Credit: Leon Neal/AFP/Getty Images

Kate Middleton, Duchess of Cambridge visit the mentoring program of the XLP project at London Wall, which supports young people who are facing emotional, behavioral and relational challenges in London, March 11... Photo Credit: James Whatling/Splash News
Kate Middleton, Duchess of Cambridge listens to a former patient during a visit to St Thomas' Hospital with Prince William, in London, March 10, 2016. Photo Credit: Toby Melville /Pool Photo via AP Photo
Catherine, Duchess of Cambridge, Princess Charlotte, Prince George and Prince William, Duke of Cambridge pose as they enjoy a short private break skiing in the French Alps, France, March 3, 2016. Photo Credit: John Stillwell/PA/EPA
Prince William, Duke of Cambridge cuddles his daughter Princess Charlotte of Cambridge as he and is family enjoy a short private break skiing in the French Alps, France, March 3, 2016. Photo Credit: John Stillwell/PA/EPA
Prince William, Duke of Cambridge, Prince George, Catherine, Duchess of Cambridge and Princess Charlotte pose for pictures as they enjoy a short private break skiing in the French Alps, France, March 3, 2016. Photo Credit: John Stillwell/PA/EPA
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge laugh after she threw a snowball at him during a short private break skiing in the French Alps, France, March 3, 2016. Photo Credit: John Stillwell/PA/EPA
Kate Middleton, Duchess of Cambridge is presented with a bunch of flowers during a visit to the Place2Be charity at Catherine's Primary School, Feb. 24, 2016, in Edinburgh, Scotland. Photo Credit: Andrew Milligan/Getty Images
Catherine, Duchess of Cambridge talks to Steven Hull, the Editor in Chief of the Huffington Post UK, on the Huffington Post landing page in the 'News Room' at Kensington Palace, Feb. 17, 2016, in London. The Du... Photo Credit: Chris Jackson/WPA Pool/Getty Images
Catherine, Duchess of Cambridge attends the 75th anniversary of the RAF Air Cadets at St Clement Danes Church in London, Feb. 7, 2016. Photo Credit: Splash News
Prince William and Kate Middleton attend a wreath laying ceremony to mark the 100th anniversary of the final withdrawal from the Gallipoli Peninsula at the War Memorial Cross, Sandringham on Jan. 10, 2016 in Ki... Photo Credit: Max Mumby/Indigo/Getty Images
Catherine, Duchess of Cambridge attends the Anna Freud Center Family School Christmas Party at the Anna Freud Center, Dec. 15, 2015 in London. The Duchess turned 34 years old on Jan. 9, 2016. Photo Credit: Chris Jackson/AFP/Getty Images
Members of the Royal Family attend the morning service at the Church of St Mary Magdalene in Sandringham, Norfolk, Dec. 27, 2015. Photo Credit: James Whatling/Splash
Kate the Duchess of Cambridge arrives with family members to attend the traditional Christmas Day church service, at St. Mary Magdalene Church in Sandringham, England, Dec. 25, 2015. Photo Credit: Matt Dunham/AP Photo
This photo released by Kensington Palace on Dec. 18, 2015 shows The Duke and Duchess of Cambridge with their two children, Prince George and Princess Charlotte, in a photograph taken late October 2015 at Kensin... Photo Credit: Chris Jelf/Kensington Palace/Getty Images
Catherine, Duchess of Cambridge attends the Anna Freud Centre Family School Christmas Party at Anna Freud Centre, Dec. 15, 2015, in London. Photo Credit: Mark Cuthbert/Getty Images
Catherine, Duchess of Cambridge visits Action on Addiction,Warminster, Wiltshire, Dec. 10, 2015.

Photo Credit: Tim Rooke/REX Shutterstock

Catherine, Duchess of Cambridge meets trader Nigel Hallagan as she and Prince William, Duke of Cambridge attend the ICAP charity day on Dec. 9, 2015 in London. Photo Credit: Jeremy Selwyn/WPA Pool/Getty Images
Kate Middleton, the Duchess of Cambridge, attends the Diplomatic Reception at Buckingham Palace on Dec. 8, 2015 in London. Photo Credit: Mark Cuthbert/UK Press via Getty Images
Catherine, Duchess of Cambridge receives a bunch of flowers from Theo Hayward age three, as she leaves after visiting a GISDA centre during a visit to Caernarfon, Nov. 20, 2015, in Wales. Photo Credit: Phil Noble/WPA Pool/Getty Images
Catherine, Duchess of Cambridge attends Place2Be Headteacher Conference at Bank of America Merrill Lynch in London, Nov. 18, 2015. Photo Credit: Danny Martindale/Getty Images
Britain's Prince William accompanied by Kate, Duchess of Cambridge and French Ambassador to London Sylvie Bermann, left, signs the book of condolences offering their sympathies for the victims of the attack in ... Photo Credit: Jonathan Brady/AP Photo
Kate Middleton, the Duchess of Cambridge, arrives for the 100 Women in Hedge Funds Galla Dinner at the Victoria and Albert Museum in London, Oct. 27, 2015.

Photo Credit: Chris Jacksoni/PA Wire/AP Photo

Catherine, Duchess of Cambridge arrives to meet children and mentors from Chance UK's Early Intervention Programme at Islington Town Hall, Oct. 27, 2015, in London. Photo Credit: Karwai Tang/WireImage/Getty Images
The Duchess of Cambridge arrives at the World Premiere of "Spectre" at the Royal Albert Hall in central London, Oct. 26, 2015. Photo Credit: Joel Ryan/Invision/AP Photo
Catherine, Duchess of Cambridge arrives at Charities Forum Day, BAFTA in London, Oct. 26, 2015.

Photo Credit: Tim Rooke/REX Shutterstock

Catherine, Duchess of Cambridge visits the Dundee Rep Theatre, Oct. 23, 2015 in Dundee, Scotland. Photo Credit: Mark Cuthbert/UK Press/Getty Images
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend an event hosted by Mind at Harrow College to mark World Mental Health Day, Oct. 10, 2015, in Harrow, England. Photo Credit: Max Mumby/Indigo/Getty Images
Catherine, Duchess of Cambridge arrives for a visit to the Rehabilitation of Addicted Prisoners Trust at HMP Send, Sept. 25, 2015, in Woking, U.K. Photo Credit: Andrew Matthews/Getty Images
Catherine, Duchess of Cambridge visits the Anna Freud Centre, Sept. 17, 2015, in London. Photo Credit: Mark Cuthbert/UK Press/Getty Images
The Duke and Duchess of Cambridge, Kate Middleton and Prince William go the Crathie Kirk for Sunday morning prayers in Scotland, Sept. 13, 2015. Photo Credit: Jesal/Tanna/Splash News
Catherine, Duchess of Cambridge arrives at the Portsmouth Historical Dockyard as she attends the America's Cup World Series event on July 26, 2015 in Portsmouth, England. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend day nine of the Wimbledon Tennis Championships at Wimbledon, July 8, 2015, in London. Photo Credit: Karwai Tang/Getty Images
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend day nine of the Wimbledon Tennis Championships at Wimbledon, July 8, 2015, in London. Photo Credit: Karwai Tang/Getty Images
Britain's Kate the Duchess of Cambridge carries Princess Charlotte after taking her out of a pram as they arrive for Charlotte's Christening at St. Mary Magdalene Church in Sandringham, England, July 5, 2015. ... Photo Credit: Chris Jackson/AP Photo
Catherine, Duchess of Cambridge arrives at the Church of St. Mary Magdalene on the Sandringham Estate for the christening of Princess Charlotte of Cambridge in King's Lynn, England, July 5, 2015. Photo Credit: Chris Jackson/Getty Images
Catherine Duchess of Cambridge and Prince George attend the Gigaset Charity Polo Match with Prince George of Cambridge at Beaufort Polo Club, June 14, 2015, in Tetbury, England. Photo Credit: Chris Jackson/Getty Images
Kate Middleton is spotted driving a Range Rover out of Buckingham Palace in London on April 28, 2015.

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Catherine, Duchess of Cambridge visits the Brookhill Children's Centre in Woolwich to find out about the work of Home Start on March 18, 2015 in London, England. Photo Credit: Alex Lentati-WPA Pool/Getty Images
Britain's Duchess of Cambridge smiles as her husband Prince William and soldiers of the 1st Battalion Irish Guards fix shamrocks to their hats at the St. Patrick's Day Parade at Mons Barracks, Aldershot, Englan... Photo Credit: Kirsty Wigglesworth/AP Photo
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge leave St Paul's Cathedral after a Service of Commemoration for troops who were stationed in Afghanistan, March 13, 2015, in London. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge poses with cast, crew and producers of Downton Abbey during an official visit to the set of Downton Abbey at Ealing Studios, March 12, 2015, in London. Photo Credit: Chris Jackson/ WPA Pool/Getty Images
Catherine, Duchess of Cambridge visits the Turner Contempary on March 11, 2015 in Margate, England. Photo Credit: Karwai Tang/WireImage/Getty Images
Britain's Duchess of Cambridge arrives for the annual Commonwealth Observance at Westminster Abbey in central London, on March 9, 2015. The Observance is the biggest multi-faith celebration in the United Kingdo... Photo Credit: Lefteris Pitarakis/AP Photo
Catherine Duchess of Cambridge is seen leaving The Goring Hotel in Victoria, London, March 2, 2015. Photo Credit: Ben Cawthra/SIPA
Catherine, Duchess of Cambridge, unveils a plaque as she visits the 'Emma Bridgewater'� pottery factory, Feb. 18, 2015, in Staffordshire, England. Photo Credit: Oli Scarff/WPA Pool/Getty Images
Catherine, Duchess of Cambridge laughs as she visits the home of Ben Ainslie Racing (BAR) in Portsmouth Old Town, Feb. 12, 2015, in Portsmouth, England. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge arrives to formally open the Kensington Leisure Centre, Jan. 19, 2015, in London. Photo Credit: Karwai Tang/Getty Images
Catherine, Duchess of Cambridge attends a coffee morning at Family Friends in Kensington, Jan. 19, 2015, in London. Family Friends is a voluntary organization to help families in deprived areas of the borough o... Photo Credit: Geoff Pugh/ WPA Pool/Getty Images
Catherine, Duchess of Cambridge attends an event hosted by The Fostering Network to celebrate the work of foster carers in providing support to vulnerable young people, Jan. 16, 2015, in London. Photo Credit: Lefteris Pitarakis/Getty Images
Catherine, Duchess of Cambridge visits the Stephen Lawrence Centre in Deptford, March 27, 2015, in London. Photo Credit: Neil Mockford/Alex Huckle
Britain's Kate, Duchess of Cambridge, arrives at a primary school in London, Jan. 15, 2015. The Duchess, Royal Patron of The Art Room organization, officially named The Clore Art Room at the school. Photo Credit: Lefteris Pitarakis/AP Photo
Catherine, Duchess of Cambridge attends the St. Andrews 600th Anniversary Dinner at Metropolitan Museum of Art in this Dec. 9, 2014 file photo in New York. Photo Credit: Jason DeCrow/Getty Images
Britain's Kate Middleton, Duchess of Cambridge, attends the royal family's traditional Christmas Day Church Service at Sandringham in eastern England, Dec. 25, 2014. Photo Credit: Paul Ellis/AFP/Getty Images
Britain's Prince William and Kate, Duchess of Cambridge leave after attending the British royal family's traditional Christmas Day church service at St. Mary Magdalene Church in Sandringham, England, Dec. 25, 2... Photo Credit: Matt Dunham/AP Photo
Britain's Catherine, Duchess of Cambridge, learning sign language as she meets with children at the newly established 23rd Poplar Beaver Scout Colony in east London on Dec. 16, 2014. The Duchess's visit support... Photo Credit: Ben Stansall/AFP/Getty Images
Kate Middleton shakes hands with Fynley Gooch, aged 7, after being helped to ice a cupcake while blindfolded as she promotes disability awareness while meeting with children at the 23rd Poplar Beaver Scout Colo... Photo Credit: Ben Stansall/Pool/AFP/Getty Images
Catherine, Duchess of Cambridge arrives at East Anglia's Children's Hospices appeal launch at Norfolk Showground, Nov. 25, 2014, in Norwich, England. Photo Credit: Mark Cuthbert/UK Press/Getty Images
Britain's Kate, Duchess of Cambridge attends the Place2be Wellbeing in Schools Award at Kensington Palace, London, Nov. 19, 2014. Photo Credit: Paul Hackett/AP Photo
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at London Palladium, Nov. 13, 2014 in London, England. Photo Credit: Mark Cuthbert/UK Press via Getty Images
Catherine, Duchess of Cambridge, Patron of SportsAid, meets potential young athletes at a SportsAid workshop at the GSK Human Performance Laboratory, Nov. 12, 2014, in West London. Photo Credit: David Parker /Getty Images
The Duchess of Cambridge watched the royal family lay a wreath at a ceremony at the Cenotaph in Whitehall London, Nov. 9, 2014. Photo Credit: Rupert Hartley/Rex
Catherine, Duchess of Cambridge visits Pembroke Refinery on Nov. 8, 2014 in Pembroke, Wales. Photo Credit: Samir Hussein/Getty Images
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit Pembroke Refinery on Nov. 8, 2014 in Pembroke, Wales. Photo Credit: Mark Cuthbert/UK Press via Getty Images
Catherine, Duchess of Cambridge attends the Action on Addiction Autumn Gala evening at L'Anima on Oct. 23, 2014 in London, England. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge visits Pembroke Refinery on Nov. 8, 2014 in Pembroke, Wales. Photo Credit: Mark Cuthbert/UK Press via Getty Images
Catherine, Duchess of Cambridge walks with museum director Michael Dixon as she leaves the Natural History Museum after she attended the Wildlife Photographer of The Year 2014 Awards Ceremony, Oct. 21, 2014 in ... Photo Credit: Stefan Wermuth/Getty Images
Catherine, Duchess of Cambridge arrives at the Natural History Museum to attend the Wildlife Photographer of The Year 2014 Awards Ceremony, Oct. 21, 2014 in London, England. Photo Credit: Arthur Edwards/Getty Images
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge are seen as they welcome the President of Singapore Tony Tan Keng Yam at the Royal Garden Hotel on Oct. 21, 2014 in London, England. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry visit the Tower of London's Ceramic Poppy Field at The Tower of London on August 5, 2014 in London, England. Each ceramic pop... Photo Credit: Stuart C. Wilson/Getty Images
Catherine, Duchess of Cambridge attends a WW1 100 Years Commemorations Ceremony at Le Memorial Interallie on August 4, 2014 in Liege, Belgium. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge plays the South African game of Three Tins during a visit to the Commonwealth Games Village on July 29, 2014 in Glasgow, Scotland. Photo Credit: Danny Lawson/Getty Images
Prince Harry, Prince William, Duke of Cambridge and his wife Catherine, Duchess of Cambridge, react as they watch the women's field hockey match between Wales and Scotland during the 2014 Commonwealth Games in ... Photo Credit: Glyn Kirk/AFP/Getty Images
This photo dated July 2, 2014, was taken to mark Prince George's first birthday and shows the Duke and Duchess of Cambridge and the Prince during a visit to the Sensational Butterflies exhibition at the Natural... Photo Credit: John Stillwell/PA Wire
This photo dated Wednesday July 2, 2014, was taken to mark Prince George's first birthday and shows the Duke and Duchess of Cambridge and the Prince during a visit to the Sensational Butterflies exhibition at t... Photo Credit: John Stillwell/PA Wire
Kate Middleton and Prince William, Duke of Cambridge attend the Simone Halep v Sabine Lisicki match on centre court during day nine of the Wimbledon Championships at Wimbledon, July 2, 2014, in London. Photo Credit: Karwai Tang/Getty Images
Kate, the Duchess of Cambridge leaves the Blessed Sacrament School in London on July 1, 2014. Photo Credit: Lefteris Pitarakis/AP Photo
Catherine, Duchess of Cambridge makes an official visit to Bletchley Park, June 18, 2014, in Bletchley, England. Photo Credit: Mark Cuthbert/UK Press/Getty Images
Catherine, Duchess of Cambridge watches as Queen Elizabeth II leads the Knights of the Garter to the Most Noble Order of the Garter Ceremony from the Galilee Porch on June 16, 2014 in Windsor, England. The Orde... Photo Credit: Getty Images
Catherine, Duchess of Cambridge is pictured with Prince George of Cambridge at the Cirencester Park Polo Club on June 15, 2014 in Cirencester, England. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge appears on the balcony of Buckingham Palace, during the Trooping The Colour parade, in central London, Saturday, June 14, 2014. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge, attends a garden party at Buckingham Palace in London on June 10, 2014. Photo Credit: John Stillwell/AFP/Getty Images
Catherine Duchess of Cambridge is seen at the America's Cup event at the National Maritime Museum in London, June 10, 2014.

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Princess Catherine, Duchess of Cambridge, speaks to World War II veterans in Arromanches-les-Bains, Normandy, France, June 6, 2014, during an event commemorating the 70th anniversary of the World War II Allied ... Photo Credit: Leon Neal/AP Photo
Britain's Catherine, The Duchess of Cambridge is greeted by children during a visit to the Macrosty Park in Crieff, Scotland on May 29, 2014. Photo Credit: Ian MacNicol/AFP/Getty Images
Catherine, Duchess of Cambridge arrives at the Portrait Gallery, April 24, 2014 in Canberra, Australia Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge receives flowers from spectators at the Playford Civic Centre, April 23, 2014 in Adelaide, Australia. Photo Credit: Daniel Kalisz/Getty Images
Catherine, Duchess of Cambridge gestures after she used the DJ decks at the youth community centre, The Northern Sound System, in Elizabeth, April 23, 2014 in Adelaide, Australia. Photo Credit: Morne de Klerk/Getty Images
Catherine, Duchess of Cambridge arrives at St Andrew's Cathedral for Easter Sunday Service on April 20, 2014 in Sydney, Australia. Photo Credit: Brendon Thorne/Getty Images
Catherine, Duchess of Cambridge visits Taronga Zoo on April 20, 2014 in Sydney, Australia. Photo Credit: Samir Hussein/Getty Images
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge feed a tree kangaroo at Taronga Zoo on April 20, 2014 in Sydney, Australia. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge, and Prince William, Duke of Cambridge meet a Koala at Taronga Zoo on April 20, 2014 in Sydney, Australia. Photo Credit: Cameron Spencer/Getty Images
Catherine, Duchess of Cambridge visits RAAF Base Amberley on April 19, 2014 in Brisbane, Australia. Photo Credit: Danny Martindale/Getty Images
Britain's Kate, the Duchess of Cambridge waves as she walks with Wing Commander Stephen Chappell while visiting RAAF Base Amberley near Brisbane, Australia, Saturday, April 19, 2014. Photo Credit: William West/AP Photo
Britain's Kate, the Duchess of Cambridge, flanked by Chief of Air Force Air Marshall Geoff Brown, left, and Commanding Officer of Number 1 Squadron, Wing Commander Stephen Chappell, makes her way into the cockp... Photo Credit: William West/AP Photo
Catherine, the Duchess of Cambridge, runs along the beach at Manly, on Sydney's north shore, April 18, 2014. Photo Credit: William West/AFP/Getty Images
Catherine, Duchess of Cambridge meets with young surf lifesavers during a surf lifesaving event on Manly Beach, April 18, 2014, in Sydney. Photo Credit: Jason Reed/Getty Images
Catherine, Duchess of Cambridge arrives at the Winmalee Guide Hall, April 17, 2014 in Winmalee, Australia. Photo Credit: Brendon Thorne/Getty Images
Catherine, Duchess of Cambridge and Prince George of Cambridge arrive at Sydney Airport on a Australian Airforce 737 aircraft, April 16, 2014 in Sydney. Photo Credit: Samir Hussein/Getty Images
Catherine, Duchess of Cambridge is seen playing cricket at Latimer Square where she attended an event to mark the 2015 Cricket World Cup, April 14, 2014 in Christchurch, New Zealand. Photo Credit: Danny Martindale/Getty Images
Catherine, Duchess of Cambridge stumbles as she walks through the vineyard with Prince William, Duke of Cambridge visit the Amisfield Winery, April 13, 2014 in Queenstown, New Zealand. Photo Credit: Arthur Edwards/Getty Images
Catherine, Duchess of Cambridge helms an America's Cup yacht as she races Prince William, Duke of Cambridge in Auckland Harbour, April 11, 2014, in Auckland, New Zealand. Photo Credit: Chris Jackson/Getty Images
Britain's Kate, the Duchess of Cambridge, smiles while attending a state reception at Government House in Wellington, New Zealand, April 10, 2014. Photo Credit: Hagen Hopkins/AP Photo
Catherine, Duchess of Cambridge attends a WW1 commemorative and Flying Day at Omaka Aviation Heritage Centre April 10, 2014 in Blenheim, New Zealand. Photo Credit: Samir Hussein/Getty Images
Britain's Kate, the Duchess of Cambridge, holds Prince George during a visit to Plunket nurse and parents group at Government House in Wellington, New Zealand, April 9, 2014. Photo Credit: Marty Melville/AP Photo
Britain's Prince George plays during a visit to Plunket nurse and parents group at Government House in Wellington, New Zealand, April 9, 2014. Plunket is a national not-for-profit organization that provides car... Photo Credit: Marty Melville/AP Photo
Britain's Prince George plays with the hair of his mother, Kate, the Duchess of Cambridge, during a visit to Plunket nurse and parents group at Government House in Wellington, New Zealand, April 9, 2014. Photo Credit: Marty Melville/AP Photo
Prince William, Duke of Cambridge touches the leg of Prince George of Cambridge with Catherine, Duchess of Cambridge as they arrive at Wellington Airport's military terminal for the start of their tour, April 7... Photo Credit: Samir Hussein/Getty Images
Prince William, Duke of Cambridge, Prince Harry and Catherine, Duchess of Cambridge attend the wedding of Lucy Meade and Charlie Budgett, March 29, 2014, in Chippenham, England. Photo Credit: Max Mumby/Indigo/Getty Images
The Duke and Duchess of Cambridge with their son Prince George and dog Lupo photographed at Kensington Palace, London, March 2014. Photo Credit: Jason Bell/Camera Press/Redux
Catherine, Duchess of Cambridge attends the St Patrick's Day parade at Mons Barracks, March 17, 2014 in Aldershot, England. Photo Credit: Getty Images
Catherine, Duchess of Cambridge, meets actress Dame Helen Mirren as Sir David Attenborough looks on during the Dramatic Arts reception at Buckingham Palace in London, Feb. 17, 2014. Photo Credit: Yui Mok/WPA/Getty Images
Catherine, Duchess of Cambridge leaves after opening the ICAP Art Room at Northolt High School in Ealing, London. Photo Credit: ZH1/ZJE/WENN.com
The Duchess of Cambridge attends The Portrait Gala 2014: Collecting To Inspire at National Portrait Gallery, Feb. 11, 2014 in London, England. Photo Credit: Ben Pruchnie/Getty Images
Kate the Duchess of Cambridge arrives to attend a Christmas Day Service with other members of the royal family at St. Mary's church on the grounds of Sandringham Estate, the Queen's royal estate in Norfolk, Eng... Photo Credit: Lefteris Pitarakis/AP Photo
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive for the Christmas Day service at Sandringham on Dec. 25, 2013 in King's Lynn, England. Photo Credit: Chris Jackson/Getty Images
Queen Elizabeth II, second from right, embraces Catherine, Duchess of Cambridge as they arrive at the Christmas Day service at Sandringham on Dec. 25, 2013 in King's Lynn, England.

Photo Credit: Chris Jackson/Getty Images

Queen Elizabeth II, right, and Catherine, the Duchess of Cambridge arrive at the Christmas Day service at Sandringham on Dec. 25, 2013 in King's Lynn, England. Photo Credit: Chris Jackson/Getty Images
Prince William and Catherine Duchess of Cambridge attend the Royal family Christmas lunch at Buckingham Palace, Dec. 18, 2013, in London. Photo Credit: Tim Rooke/Rex/REX USA
Britain's Prince William and Kate, Duchess of Cambridge, arrive at the Natural History Museum in London, to attend a screening of the film "David Attenborough's Alive 3D," Dec. 11, 2013. The Duchess o... Photo Credit: Lefteris Pitarakis/AP Photo
Britain's Prince William and Kate, Duchess of Cambridge, arrive at the Natural History Museum in London, to attend a screening of the film "David Attenborough's Alive 3D," Dec. 11, 2013. Photo Credit: Mark Cuthbert/UK Press via Getty Images
Catherine, Duchess Of Cambridge, holds a frog hand puppet visits the children's hospice Shooting Star House in London, Dec. 6, 2013. Photo Credit: Bradley Page/Daily Mail/EPA
Britain's Kate the Duchess of Cambridge and her husband Prince William arrive to attend the UK premiere of the movie "Mandela: Long Walk to Freedom" at a cinema in London on Dec. 5, 2013. Photo Credit: Matt Dunham/AP Photo
Catherine, Duchess of Cambridge attends the Royal film performance of "Mandela: Long Walk To Freedom" at Odeon Leicester Square on December 5, 2013 in London. (Photo by ) Photo Credit: Danny Martindale/Getty Images
Catherine, Duchess of Cambridge is seen leaving Kensington Palace for the Diplomatic reception at Buckingham Palace, Dec. 3, 2013. Photo Credit: Jesal/Tanna/Splash News
Catherine, Duchess of Cambridge attends the annual SportsAid dinner at Victoria Embankment Gardens, Nov. 28, 2013 in London. Photo Credit: Danny Martindale/Getty Images
The Duchess of Cambridge stepped out solo Thursday night for the annual SportsAid charity dinner at Victoria Embankment Gardens, Nov. 28, 2013 in London. The new mom, 31, looked stylish in a black dress by des... Photo Credit: Mark Cuthbert/UK Press/Getty Images
Catherine, Duchess of Cambridge arrives at Clifford Chance for a Place2Be forum at Canary Wharf, Nov. 20, 2013, in London. Photo Credit: Mark Cuthbert/UK Press/Getty Images
Catherine, Duchess of Cambridge visits the Only Connect and ex-offenders projects, Nov. 19, 2013, in London. Photo Credit: Ben Pruchnie/FilmMagic/Getty Images
Britain's Kate, The Duchess of Cambridge, listens from a balcony during the service of remembrance at the Cenotaph in Whitehall, London, Sunday, Nov. 10, 2013. The annual remembrance service is to remember all ... Photo Credit: Kirsty Wigglesworth/AP Photo
Britain's Catherine, Duchess of Cambridge, prepares to meet staff and volunteers from the Royal British Legions London Poppy Day Appeal at Kensington Palace in central London, Nov. 7, 2013. Photo Credit: Carl Court/AFP/Getty Images
Britain's Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, ride with television personality Barbara Windsor on the 1960s Routemaster bus as they meet London Poppy Day staff and volunteers... Photo Credit: Carl Court/AFP/Getty Images
Director of 100WHF Amanda Pullinger (L) and Chairman 100WHF Mimi Drake (R) meet Catherine, Duchess of Cambridge (R) at a gala dinner in aid of Action on Addiction hosted by the 100 Women in Hedge Funds Philanth... Photo Credit: Ian West/WPA Pool/Getty Images
Catherine, Duchess of Cambridge, holds her son Prince George of Cambridge following his Christening at Chapel Royal in St James's Palace in central London, Oct. 23, 2013. Photo Credit: John Stillwell/AFP/Getty Images
On the left, Britain's Prince William, right, Kate Duchess of Cambridge with their son Prince George leave the Chapel Royal in St James's Palace in London, with the Archbishop of Canterbury Justin Welby after ... Photo Credit: AP Photo|Reuters
Britain's Catherine, Duchess of Cambridge, plays volleyball during a trip to the SportsAid Athlete Workshop in the Copper Box at the Queen Elizabeth Olympic Park in east London, Oct. 17, 2013. Photo Credit: Carl Court/AFP/Getty Images
The royal family were out in force at Crathie Kirk, Balmoral, Sept. 22, 2013. Prince William drove Catherine to the service and were followed by Prince Charles and Camilla then The Queen and Prince Philip. Photo Credit: Splash News
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Tusk Conservation Awards at The Royal Society on Sept. 12, 2013 in London. Photo Credit: Danny E. Martindale/Getty Images
Kate Middleton made her first post-baby public appearance August 30, 2013 at the Ring O'Fire Anglesey Coastal Ultra Marathon in Holyhead, Wales. The Duchess of Cambridge sported a green blazer, patterned cr&egr... Photo Credit: Mark Cuthbert/UK Press via Getty Images
Britain's Prince William and Kate, Duchess of Cambridge hold the Prince of Cambridge, July 23, 2013, as they pose for photographers outside St. Mary's Hospital exclusive Lindo Wing in London where the Duchess g... Photo Credit: Lefteris Pitarakis/AP Photo
Britain's Prince William and Kate, Duchess of Cambridge hold the Prince of Cambridge, July 23, 2013, as they pose for photographers outside St. Mary's Hospital exclusive Lindo Wing in London where the Duchess g... Photo Credit: Lefteris Pitarakis/AP Photo
Britain's Prince Harry, left, Kate, Duchess of Cambridge, center, and Prince William, on the balcony of Buckingham Palace, during the Trooping The Colour parade, in London, Saturday, June 15, 2013.Other royals ... Photo Credit: Sang Tan/AP Photo
Catherine, Duchess of Cambridge cuts the ribbon to break the bottle of Moet & Chandon Brut Imperial Champagne against the ship for the Princess Cruises naming ceremony at Ocean Terminal, June 13, 2013 in So... Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge attends a service marking the 60th anniversary of the Queen's coronation at Westminster Abbey, June 4, 2013 in London. Photo Credit: Mark Cuthbert/UK Press/Getty Images
Prince Charles, left, Camilla, the Duchess of Cornwall and Catherine, the Duchess of Cambridge attend a Garden Party on the grounds of Buckingham Palace in London, May 22, 2013. Photo Credit: John Stillwell/ AFP/Getty Images
Britain's Kate, Duchess of Cambridge arrives back at Buckingham Palace in a horse drawn carriage after the Trooping The Colour parade, at the Horse Guards Parade in London, Saturday, June 15, 2013. Photo Credit: Sang Tan/AP Photo
Kate Middleton, The Duchess of Cambridge, visits Naomi House Children'­s Hospice on her 2nd wedding anniversary to Prince William to celebrate Children's Hospice Week 2013, April 29, 2013 in Winchester, Eng... Photo Credit: Barcroft Media/startraksphoto.com
Duchess of Cambridge Kate Middleton joins Prince William and Prince Harry to have a magical day out with a visit to the studio where the "Harry Potter" movies were filmed, April 26, 2013. Photo Credit: Chris Jackson/AFP/Getty Images
Britain's Kate, the Duchess of Cambridge, in her capacity as patron of "The Art Room", arrives to attend an evening reception to celebrate the work of the charity at the National Portrait Gallery in L... Photo Credit: Startracks
Catherine, Duchess of Cambridge, right, arrives to visit The Willows Primary School, Wythenshawe to launch a new school counseling program, April 23, 2013 in Manchester, England.

Photo Credit: Paul Ellis/WPA Pool/Getty Images

Britain's Duchess of Cambridge, attends the National Review of Queen's Scouts at Windsor Castle, near London, April 21, 2013. Photo Credit: Olivia Harris-Pool/AP Photo
The Duchess of Cambridge, known as the Countess of Strathearn when in Scotland, smiles during a visit to Dumfries House in Ayrshire, Scotland, to attend the opening of an outdoor centre, Friday April 5, 2013. Photo Credit: Danny Lawson/Getty Images
Kate Middleton, also known as the Countess of Strathearn when in Scotland, visits The Emirates Arena in a tartan coat on April 4, 2013 in Glasgow, United Kingdom. The Emirates Arena will play host to several ev... Photo Credit: Mark Cuthbert/Getty Images
Kate Middleton bundles up around the fire at the Great Tower Scout Camp near Newby Bridge in Cumbria on March 22, 2013. The Duchess of Cambridge tried her hand at roasting pastries as an honorary member of th... Photo Credit: @UKScouting/Twitter
The Duchess of Cambridge, right, accompanies Queen Elizabeth II and Prince Philip, obscured at left, to a London subway station to mark the 150th anniversary of the London Underground on March 20, 2013. Photo Credit: Sang Tan/AP Photo
Kate Middleton, Duchess of Cambridge, arrives at the Clare Foundation in London, wearing a white wool coat, March 19, 2013. Photo Credit: Wenn.com
While handing out shamrocks to members of the Irish Guards on St Patrick's Day on March 17, 2013 in Aldershot, England, the Duchess of Cambridge managed to get her black suede shoe wedged in a drain. Luckily, P... Photo Credit: Danny Martindale/WireImage/Getty Images
Catherine, Duchess of Cambridge attends Day 4 of The Cheltenham Festival at Cheltenham Racecourse on March 15, 2013 in England. Photo Credit: Indigo/Getty Images
A pregnant Kate Middleton met with children at Humberside Fire and Rescue during an official visit to Grimsby, England March 5, 2013. Photo Credit: Samir Hussein/WireImage/Getty Images
The Duchess of Cambridge, Kate Middleton, The Duke of Cambridge, Prince William and Prince Harry attend the wedding of Mark Tomlinson and Laura Bechtolsheimer in Arosa, Switzerland, March 2, 2013.

Photo Credit: Splash News

Britain's Kate, The Duchess of Cambridge arrives at Hope House, in London, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from su... Photo Credit: Matt Dunham/AP Photo
Catherine, Duchess of Cambridge, sporting a 'Sofie Rae' dress from Whistles, smiles after viewing her newly-commissioned portrait by artist Paul Emsley at the National Portrait Gallery in central London, Jan. 1... Photo Credit: John Stillwell - WPA Pool/Getty Images
A newly-commissioned portrait of Kate, Duchess of Cambridge, by artist Paul Emsley hangs at the National Portrait Gallery in London, Jan. 11, 2013. While the painting reveals a more mature Middleton, art critic... Photo Credit: Sang Tan/AP Photo
Prince William and Catherine, Duchess of Cambridge, attend the Eucharist at St. Marks Church in Englefield, Berkshire, England, Dec. 25, 2012. Photo Credit: Jesal Parshotam/Splash
Winner of Sports Personality of the Year 2012, Bradley Wiggins with David Beckham (L) and and Kate Middleton, The Duchess of Cambridge (R) during the BBC Sports Personality of the Year Awards 2012 at ExCeL Aren... Photo Credit: David Davie/EPA
Kate Middleton, the Duchess of Cambridge, plays hockey during her visit to St. Andrew's School, where she attended from 1986 to 1995, in Pangbourne, England, on Nov. 30, 2012. Photo Credit: Arthur Edwards/AP Photo
Kate Middleton showed off her new hairdo and bundled up in a tan coat during an official visit to The Guildhall with Prince William, Duke of Cambridge, Nov. 28, 2012 in Cambridge, England. Will and Kate arrived... Photo Credit: Mark Cuthbert/UK Press via Getty Images
Catherine, The Duchess of Cambridge attends the official opening of The Natural History Museums's Treasures Gallery at Natural History Museum on Nov. 27, 2012 in London, England. Middleton dazzled the crowd wit... Photo Credit: Mark Cuthbert/UK Press/Getty Images
The Duchess of Cambridge was presented with a bouquet of flowers before watching a rugby match between Wales and New Zealand at the Millennium Stadium in Cardiff. Photo Credit: Michael Steele - WPA Pool/Getty Images
Catherine, Duchess of Cambridge attends Remembrance Sunday at the Cenotaph on Whitehall on Nov. 11, 2012 in London. She wore a black Diane Von Furstenberg military-style coat for the occasion. Photo Credit: Samir Hussein/WireImage/Getty Images
Kate Middleton recycled a lace Alice Temperley dress for a gala dinner in support of the University of St. Andrews 600th Anniversary Campaign at Middle Temple Hall on Nov. 8, 2012, in London. The Duchess of Cam... Photo Credit: Indigo/Getty Images
Prince William and Kate Middelton are seen leaving private members club Loulou's in London at 1 a.m. on Oct. 11, 2012. The couple was reunited for their night out in the British capital after William attended a... Photo Credit: Xposure
Prince William and Kate Middleton spoke with the England team Oct. 9, 2012 during the official launch of The Football Association's National Football Center at St George's Park in Burton-upon-Trent, England. Th... Photo Credit: Michael Regan/The FA via Getty Images
Prince William and Kate Middleton visited the Middle Temple in London Oct. 8, 2012. This is their first public appearance since their tour of Southeast Asia and the South Pacific last month when a French magazi... Photo Credit: Chris Jackson/AP Photo
Kate Middleton, Duchess of Cambridge, was among guests at the wedding of Thierry Kelaart and Patrick Heathcoat-Amory, at St Bartholomew's Church in Oxfordshire, England Sept. 19, 2012. Kelaart is a close friend... Photo Credit: Ikon Pictures Ltd. I Rex USA
Kate Middleton shook and shimmied the night away on the island of Tuvalu Sept. 18, 2012. The Duke and Duchess of Cambridge donned traditional grass skirts at a gathering of the island chiefs. Kate also sprayed ... Photo Credit: Arthur Edwards/Getty Images
Kate Middleton and Prince William received a traditional welcome to the village of Marau before traveling to Tavanipupu Island as part of their southeast Asia tour. The Duke and Duchess of Cambridge received be... Photo Credit: Samir Hussein/Getty Images
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit a cultural village on their Diamond Jubilee tour of the Far East, Sept. 17, 2012 in Honiara, Guadalcanal Island. Photo Credit: Chris Jackson/Getty Images
Britain's William and his wife Kate, the Duke and Duchess of Cambridge, leave the Cultural village in Honiara, Sept. 17, 2012. Photo Credit: Daniel Munoz/AP Photo
Britain's Prince William, left, and wife Kate, the Duchess of Cambridge, right, pose for a photo in Honiara, Solomon Islands, Sept. 16, 2012. Photo Credit: William West-Pool/Getty Images
Catherine, the Duchess of Cambridge, arrives with her husband Britain's Prince William at the airport in Honiara on Sept. 16, 2012. Photo Credit: WILLIAM WEST/AFP/GettyImages
Prince William and his wife Kate, the Duke and Duchess of Cambridge arrive at Danum Valley Research Center in Danum Valley, Sabab, Malaysia, Saturday, Sept. 15, 2012. Photo Credit: Vincent Thian/ Pool/AP Photo
Catherine, Duchess of Cambridge attends a tea party at the British High Commission on day 4 of Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge's Diamond Jubilee Tour of the Far East on Sep... Photo Credit: Danny Lawson - Pool/Getty Images
Catherine, Duchess of Cambridge visits Assyakirin Mosque on day 4 of Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge's Diamond Jubilee Tour of the Far East on Sept. 14, 2012 in Kuala Lumpu... Photo Credit: Chris Jackson/Getty Images
Kate Middleton chose a low-cut, gold and white Alexander McQueen dress for a formal dinner in Malaysia. The Duchess of Cambridge and her husband, Prince William, dined with Malaysian King Sultan Abdul Halim Mu'... Photo Credit: Malaysia Information Department/AP Photo
On her last day in Singapore, Kate Middleton paid her respects at a Commonwealth war graves cemetery Sept. 13. The Duchess of Cambridge wore a pale blue pleated dress and carried a Chinese parasol. With the hel... Photo Credit: Wong Maye-E/AP Photo
Catherine, Duchess of Cambridge attends a cultural event in Queenstown on day 2 of their Diamond Jubilee tour on Sept. 12, 2012 in Singapore. Photo Credit: Samir Hussein/WireImage/Getty Images
Catherine, Duchess of Cambridge visits Gardens by the Bay on day 2 of the Diamond Jubilee Tour of the Far East, Sept. 12, 2012 in Singapore. Photo Credit: Mark Large/Pool/Getty Images
Britain's Prince William and his wife Catherine, the Duchess of Cambridge, listen to speeches at a British Gala reception at the Eden Hall in Singapore, Sept. 12, 2012. Photo Credit: Nicolas Asfouri/AP Photo
The Duchess of Cambridge did Prabal Gurung proud when she wore one of his dresses in Singapore on Sept. 11. Gurung, a Singapore-born designer, is one of the most promising young designers working in the U.S. Photo Credit: Arthur Edwards/WPA/Getty Images
Kate Middleton wears a kimono-style pink dress as she visits Singapore Botanical Gardens on the first day of a Diamond Jubilee tour on Sept. 11, 2012. Middleton and Prince William will visit Singapore, Malaysia... Photo Credit: Danny Lawson/Getty Images
Britain's Kate, The Duchess of Cambridge awards the gold medal to Britain's Aled Davies for winning the men's discus throw F42 at the 2012 Paralympics, Sept. 2, 2012, in London. Photo Credit: Matt Dunham/AP Photo
Catherine, Duchess of Cambridge arrives at the Eton Dorney venue to watch the days rowing competitions on day 4 of the London 2012 Paralympic Games at Eton Dorney on September 2, 2012 in Windsor, England. Photo Credit: Matthew Lloyd/Getty Images
Catherine, Duchess of Cambridge, claps while watching track cycling during the 2012 Paralympic Games at the Velodrome in London, Aug. 30, 2012. Photo Credit: Chris Jackson/Getty Images
Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, share a laugh as they watch track cycling during the 2012 Paralympic Games at the Velodrome in London, Aug. 30, 2012. Photo Credit: Chris Jackson/Getty Images
Catherine, Duchess of Cambridge, leaves after watching a goalball game during the 2012 Paralympic Games at the Olympic Park's Copper Box in east London, Aug. 30, 2012. Photo Credit: Stefan Rousseau/AFP/Getty Images
Kate Middleton, wearing a blue and purple Whistles dress, spends a moment with Prime Minister David Cameron, left, and his wife, Samantha, at the closing ceremony of the 2012 London Olympic Games at the Olympic... Photo Credit: John Stillwell/AFP/Getty Images
Britain's Kate, Duchess of Cambridge, leaves after watching a women's hockey bronze medal match between Britain and New Zealand at the 2012 Summer Olympics, London, Aug. 10, 2012. Britain won the bronze medal. Photo Credit: Jae C. Hong/AP Photo
Catherine, Duchess of Cambridge, center, talks to Team GB after their Women's Hockey bronze medal match against New Zealand on Day 14 of the London 2012 Olympic Games, Aug. 10, 2012 in London, England. Photo Credit: Pascal Le Segretain/Getty Images
Prince Harry and Kate Middleton, Duchess of Cambridge visit athletes at Team GB House in the Westfield Centre on Day 13 of the London 2012 Olympic Games on Aug. 9, 2012 in London, England. Middleton and Prince ... Photo Credit: John Stillwell/Getty Images
Britain's Catherine, Duchess of Cambridge, applauds Britain's handball team at the end of the women's preliminary Group A handball match, Croatia vs, Great Britain, for the London 2012 Olympics Games on Aug. 5,... Photo Credit: Javier Soriano/AFP/Getty Images
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge applaud the gold medal victory by the Team GB Men's Team Pursuit in the Track Cycling on Aug. 3, 2012 in London, England. Photo Credit: John Stillwell/Getty Images
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge embrace after Philip Hindes, Jason Kenny and Sir Chris Hoy of Great Britain win the gold and a new world record in the Men's Team Sprint Tra... Photo Credit: Pascal Le Segretain/Getty Images
Prince William and Kate, Duchess of Cambridge, join the crowd in doing the wave at a match at Wimbledon in London at the 2012 Summer Olympics, Thursday, August 2, 2012. Photo Credit: AP Photo/Mark Humphrey
Kate Middleton arrives at the Royal Academy of Arts in London for the UK creative industries reception on July 30, 2012. Middleton looked ravishing in a gray dress designed by Roksanda Ilincic. The Duchess of C... Photo Credit: Geoff Pugh/AP Photo
Kate Middleton and Prince William attend the Cross Country Phase of The Eventing at Greenwich Park, on the third day of the London 2012 Olympics. The Duchess of Cambridge wore a classic blue blazer and simple w... Photo Credit: Owen Humphreys/PA Wire/Press Association Images
Catherine, Duchess of Cambridge attends the Eventing Cross Country Equestrian event of the London 2012 Olympic Games at Greenwich Park on July 30, 2012. Photo Credit: Pascal Le Segretain/Getty Images
Prince William and his wife Kate, the Duke and Duchess of Cambridge, and Prince Harry are joined by children from the Team Britain Ambition Program as they watch Wai Ming hand over the London 2012 Olympic Torch... Photo Credit: Ian West /AP Photo
Torchbearer 170 passes the Olympic Flame to Torchbearer 171 in front of Buckingham Palace in the presence of the Duke and Duchess of Cambridge and Prince Harry on the torch relay leg through Westminster, July 2... Photo Credit: Gareth Fuller/AP Photo
Kate Middleton visits The National Portait Gallery's "Road to 2012: Aiming High Exhibition," July 19, 2012 in London. The Duchess wore an electric blue Stella McCartney dress and an Olympic inspired n... Photo Credit: Samir Hussein/WireImage/Getty Images
Kate, Duchess of Cambridge, right, speaks with her sister Pippa Middleton as they watch Roger Federer of Switzerland face Andy Murray of Britain during the men's final match at the All England Lawn Tennis Champ... Photo Credit: Kirsty Wigglesworth/AP Photo
The Duchess of Cambridge looked impeccable as always while joining the Queen and the Duke of Edinburgh for Prince William's Thistle Service. Middleton wore a pale yellow coat dress by Emilia Wickstead and carri... Photo Credit: Chris Jackson/Getty Images
Kate Middleton and Prince William make their way to their seats in the Royal Box on Centre Court during Day 9 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club. The duc... Photo Credit: Clive Rose/Getty Images
Wax figures of the Duke and Duchess of Cambridge are pictured wearing England supporters' hats, scarves and flags in support of England's participation in the Euro 2012, at Madame Tussauds, London, Friday, June... Photo Credit: Jonathan Short/AP Photo
(L-R) Sophie Rhys-Jones, Countess of Wessex, Catherine, Duchess of Cambridge and Camilla, Duchess of Cornwall attend the annual Order of the Garter Service at St George's Chapel, Windsor Castle on June 18, 2011... Photo Credit: Paul Edwards - WPA Pool/Getty Images
Catherine, Duchess of Cambridge attends The Golden Metropolitan Polo Club Charity Cup polo match, in which Prince William, Duke of Cambridge and Prince Harry played, at the Beaufort Polo Club on June 17, 2012 i... Photo Credit: Indigo/Getty Images
Catherine, Duchess of Cambridge interacts with schoolchildren at an 'Expanding Horizons' Primary School camp in Kent, on June 17, 2012 in Wrotham, England. Photo Credit: David Parker/Getty Images
Catherine, Duchess of Cambridge participated in several outdoor activities at the Widehorizons Margaret McMillan House in Kent, on June 17, 2012 in Wrotham, England. Photo Credit: David Parker/Getty Images
Kate Middleton wore a silver-gray Erdem dress to celebrate the Queen's official birthday. The Duchess of Cambridge rode in a horse drawn carriage to see the Trooping The Colour at the Horse Guards Parade in Lon... Photo Credit: Sang Tan/AP Photo
Catherine, Duchess of Cambridge waves from the balcony of Council House in Nottingham, central England, June 13, 2012 during a visit. Middleton dazzled in a powder blue tweed M Missoni coat dress on the latest ... Photo Credit: Rui Vieira/AFP/ Getty Images
Catherine, Duchess of Cambridge attends the wedding of Emily McCorquodale and James Hutt at The Church of St. Andrew and St. Mary, Stoke Rochford on June 9, 2012 in Grantham, England. She wore a pale gray dress... Photo Credit: Indigo/Getty Images
Catherine, Duchess of Cambridge takes part in The Thames River Pageant, as part of the Diamond Jubilee, marking the 60th anniversary of the accession of Queen Elizabeth II on June 3, 2012 in London, England. Photo Credit: Danny Martindale/WireImage/Getty Images
Catherine, Duchess of Cambridge meets guests during a garden party at Buckingham Palace on May 29, 2012 in London, England. She wore the same simple pleated dress for the Royals for the Queen's celebratory lunc... Photo Credit: Anthony Devlin - WPA Pool /Getty Images
Catherine, Duchess of Cambridge, Camilla, Duchess of Cornwall, Princess Royal and Prince Charles, Prince of Wales attend a garden party at Buckingham Palace on May 29, 2012 in London, England. Photo Credit: Anthony Devlin - WPA Pool /Getty Images
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge during a reception in the Waterloo Chamber, before the Lunch For Sovereign Monarchs at Windsor Castle, on May 18, 2012 in Windsor, England. Photo Credit: Arthur Edwards/WPA Pool/Getty Images
While her husband Prince William rode horseback at a charity polo match May 13, 2012, in Berkshire, England, Duchess of Cambridge Kate Middleton displayed her long athletic legs in a short sea-green dress and h... Photo Credit: Almasi/Splash News
Catherine, Duchess of Cambridge attended at 'Our Greatest Team Rises -BOA Olympic Concert' at the Royal Albert Hall on May 11, 2012 in London, England. She wore a teal dress by one of her favorite designers, Je... Photo Credit: Chris Jackson/Getty Images
The Duchess of Cambridge dazzled crowds as she accompanied Price William on Monday night to a meeting of the Thirty Club, which consists of some of Britain's most powerful ad and media types, at the famed Clari... Photo Credit: Splash News
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the UK Premiere of 'African Cats' in aid of Tusk Trust at BFI Southbank on April 25, 2012 in London, England. Photo Credit: Mark Large/Getty Images
A guard faints during a St. Patrick's Day parade visit by Kate Middleton, duchess of Cambridge. Photo Credit: ABC News
Kate Middleton shopped for groceries in Anglesey, North West Wales May 5, 2011. "She loaded all the shopping into her car on her own, then skipped as she ran the trolley back to the park," an told the... Photo Credit: ABC News

Prince Harry's girlfriend, Meghan Markle, has been seen in a shorter version of the dress Kate wore Wednesday evening.

Britain's Kate, the Duchess of Cambridge, arrives to attend the 2017 Gala Dinner for The Anna Freud National Centre for Children and Families (AFNCCF), held at Kensington Palace in London, Nov. 7, 2017 | Meghan Markle at the "Characters Unite/Moth Storytelling Event" in Los Angeles, Feb. 15, 2012.

Kate, who is known for recycling some of her most elegant outfits, last wore the gown when she was expecting her 2-year-old daughter, Princess Charlotte, in 2014.

Catherine, Duchess of Cambridge, attends The Royal Variety Performance at the London Palladium, Nov. 13, 2014 in London.

Kate, also the mother of Prince George, 4, has made limited appearances since announcing her third pregnancy in September.

Kate Middleton speaks to various guests at the 2017 Gala Dinner for The Anna Freud National Centre for Children and Families (AFNCCF) at Kensington Palace in London, Nov. 7, 2017.
Kate Middleton attends the 2017 Gala Dinner for The Anna Freud National Centre for Children and Families (AFNCCF), in The Orangery at Kensington Palace in London, Nov. 7, 2017.

Kensington Palace announced at the time that Kate was suffering from hyperemesis gravidarum, or severe morning sickness.

Kate has tried to stick to her schedule of engagements as her health allows, particularly for events that benefit young children and raise awareness for mental health.

She hosted an event today for Place2Be, a charity for which Kate also serves as royal patron. Place2Be provides in-house counselors and professionals to support adolescents suffering from mental health challenges, stress and anxiety.

"As a mother just getting used to leaving my own child at the school gates, it is clear to me that it takes a whole community to help raise a child," Kate said at today's forum. "Whether we are school leaders, teachers, support staff or parents, we're all in this together."

She added, "We are all working to give children the emotional strength they need to face their futures and thrive."

Tuesday's gala benefited the Anna Freud National Centre for Children and Families, an organization dedicated to mental health accessibility and treatment for young children in need. Kate has been a champion of better resources for maternal mental health and programs that support early intervention for vulnerable children and families.

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