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, Kate announced the baby's due date will be in April 2018.

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.

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 center of the southern German town of Heidelberg, July 20, 2017.

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.

The Duchess of Cambridge watches Andy Murray beat Alexander Bublik on Day one of the 2017 Wimbledon Tennis Championships, July 3, 2017, London.

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, 2017 in London.

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.

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 Palace, May 16, 2017, in London.

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.

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.

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 from inner cities the chance to spend a week on a real working farm.

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.

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend Easter Sunday service at Windsor Castle in Windsor, England, April 16, 2017.

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 Lane, April 4, 2017, in London.

Catherine, Duchess of Cambridge, arrives at the 2017 Portrait Gala at the National Portrait Gallery in London, March 28, 2017.

Catherine, Duchess of Cambridge, at Cavalry Barracks, Hounslow, during the Irish Guards St. Patrick's Day Parade, in London, March 17, 2017.

Catherine, Duchess of Cambridge visits the Ronald McDonald House Evelina London, Feb. 28, 2017, in London.

Catherine, Duchess of Cambridge visits MIST, a child and adolescent mental health project, Feb. 22, 2017 in Pontypool, Wales.

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.

Catherine, Duchess of Cambridge arrives for a visit to the CBUK Stratford, Jan. 11, 2017, in London, England.

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 in Englefield, near Bucklebury in southern England, Dec. 25, 2016.

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.

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.

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.

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.

The Duchess of Cambridge attends the Remembrance Sunday service at The Cenotaph in London, Nov. 13, 2016.

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.

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.

Catherine Duchess of Cambridge is seen at The National Football Museum in Manchester, Oct. 14, 2016.

Catherine, Duchess of Cambridge visits Bouwkeet, the social Makerspace of Bospolder-Tussendijken on Oct. 11, 2016 in The Hague, Netherlands.

Kate, the Duchess of Cambridge, is greeted by Dutch King Willem-Alexander upon her arrival in The Hague, Netherlands, Oct. 11, 2016.

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.

Catherine, Duchess of Cambridge arrives by Sea Plane in Vancouver, Sept. 25, 2016 in Vancouver, Canada.

Catherine, Duchess of Cambridge leaves Stewards Academy, Sept. 16, 2016, in Harlow, England.

Catherine, Duchess of Cambridge is seen at Tresco Abbey Gardens during a visit to Cornwall, Sept. 2, 2016, in Tresco, England.

Britain's Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, begin their visit to Cornwall in Truro, Sept. 1, 2016.

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.

The Duke and Duchess of Cambridge arrive at Bute Mills in Luton, where they will tour the facilities of national charity Youthscape.

Catherine, Duchess of Cambridge visits Land Rover BAR boat shed at the America's Cup World Series, July 24, 2016, in Portsmouth, England.

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.

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.

Catherine, Duchess of Cambridge, stands in the royal box watching the ladies semifinals at Wimbledon Tennis Championships in London, July 7, 2016.

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.

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 battlefields of the Somme in France, June 30, 2016.

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 battlefields of the Somme from the top of the Thiepval Monument in France, June 30, 2016.

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.

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.

(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 Edinburgh stand on the balcony of Buckingham Palace during the Trooping the Color, this year marking the Queen's 90th birthday at The Mall, June 11, 2016 in London.

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.

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 pre-dinner reception, as well as some of the charity's key supporters.

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.

Catherine, Duchess of Cambridge attends Chelsea Flower Show press day at Royal Hospital Chelsea, May 23, 2016 in London.

Catherine, Duchess of Cambridge, patron of the 1851 Trust, arrives at Land Rover BAR, May 20, 2016 in Portsmouth, England.

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.

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.

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 London.

Catherine, Duchess of Cambridge is seen leaving the "Vogue 100: A Century Of Style" exhibition at National Portrait Gallery, May 4, 2016, in London.

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 the royal visit to India and Bhutan on April 10, 2016 in Mumbai, India.

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 Mumbai, India.

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.

Catherine, Duchess of Cambridge opens the new EACH Charity Shop, March 18, 2016, in Holt, Norfolk.

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 Elizabeth II has been Head of the Commonwealth throughout her 60 year reign. Organised by the Royal Commonwealth Society, the Service is the largest annual inter-faith gathering in the United Kingdom.

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, 2016.

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.

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.

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.

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.

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.

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.

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 Duchess of Cambridge is supporting the launch of the Huffington Post UK's initiative 'Young Minds Matter' by guest editing the Huffington Post UK.

Catherine, Duchess of Cambridge attends the 75th anniversary of the RAF Air Cadets at St Clement Danes Church in London, Feb. 7, 2016.

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 King's Lynn, England.

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.

Members of the Royal Family attend the morning service at the Church of St Mary Magdalene in Sandringham, Norfolk, Dec. 27, 2015.

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.

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 Kensington Palace in London.

Catherine, Duchess of Cambridge attends the Anna Freud Centre Family School Christmas Party at Anna Freud Centre, Dec. 15, 2015, in London.

Catherine, Duchess of Cambridge visits Action on Addiction,Warminster, Wiltshire, Dec. 10, 2015.

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.

Kate Middleton, the Duchess of Cambridge, attends the Diplomatic Reception at Buckingham Palace on Dec. 8, 2015 in London.

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.

Catherine, Duchess of Cambridge attends Place2Be Headteacher Conference at Bank of America Merrill Lynch in London, Nov. 18, 2015.

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 Paris, at the French Embassy, Knightsbridge, London, Nov. 17, 2015.

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.

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.

The Duchess of Cambridge arrives at the World Premiere of "Spectre" at the Royal Albert Hall in central London, Oct. 26, 2015.

Catherine, Duchess of Cambridge arrives at Charities Forum Day, BAFTA in London, Oct. 26, 2015.

Catherine, Duchess of Cambridge visits the Dundee Rep Theatre, Oct. 23, 2015 in Dundee, Scotland.

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.

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.

Catherine, Duchess of Cambridge visits the Anna Freud Centre, Sept. 17, 2015, in London.

The Duke and Duchess of Cambridge, Kate Middleton and Prince William go the Crathie Kirk for Sunday morning prayers in Scotland, Sept. 13, 2015.

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.

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.

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.

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.

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.

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.

Kate Middleton is spotted driving a Range Rover out of Buckingham Palace in London on April 28, 2015.

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.

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, England, March 17, 2015.

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.

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.

Catherine, Duchess of Cambridge visits the Turner Contempary on March 11, 2015 in Margate, England.

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 Kingdom and takes the form of an hour long service in Westminster Abbey. The Duchess is expecting her second child in April.

Catherine Duchess of Cambridge is seen leaving The Goring Hotel in Victoria, London, March 2, 2015.

Catherine, Duchess of Cambridge, unveils a plaque as she visits the 'Emma Bridgewater'� pottery factory, Feb. 18, 2015, in Staffordshire, England.

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.

Catherine, Duchess of Cambridge arrives to formally open the Kensington Leisure Centre, Jan. 19, 2015, in London.

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 of Kensington.

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.

Catherine, Duchess of Cambridge visits the Stephen Lawrence Centre in Deptford, March 27, 2015, in London.

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.

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.

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.

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, 2014.

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 supports the Scout Association's 'Better Prepared' campaign, which aims to help communities to deliver Scouting to two hundred locations across the UK where Scouting can have the biggest impact.

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 Colony in London on Dec. 16, 2014.

Catherine, Duchess of Cambridge arrives at East Anglia's Children's Hospices appeal launch at Norfolk Showground, Nov. 25, 2014, in Norwich, England.

Britain's Kate, Duchess of Cambridge attends the Place2be Wellbeing in Schools Award at Kensington Palace, London, Nov. 19, 2014.

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at London Palladium, Nov. 13, 2014 in London, England.

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.

The Duchess of Cambridge watched the royal family lay a wreath at a ceremony at the Cenotaph in Whitehall London, Nov. 9, 2014.

Catherine, Duchess of Cambridge visits Pembroke Refinery on Nov. 8, 2014 in Pembroke, Wales.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit Pembroke Refinery on Nov. 8, 2014 in Pembroke, Wales.

Catherine, Duchess of Cambridge attends the Action on Addiction Autumn Gala evening at L'Anima on Oct. 23, 2014 in London, England.

Catherine, Duchess of Cambridge visits Pembroke Refinery on Nov. 8, 2014 in Pembroke, Wales.

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 London, England.

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.

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.

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 poppy represents an allied victim of the First World War and the display is due to be completed by Armistice Day on November 11, 2014.

Catherine, Duchess of Cambridge attends a WW1 100 Years Commemorations Ceremony at Le Memorial Interallie on August 4, 2014 in Liege, Belgium.

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.

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 Glasgow, Scotland, on July 28, 2014.

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 History Museum, London.

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 the Natural History Museum, London.

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.

Kate, the Duchess of Cambridge leaves the Blessed Sacrament School in London on July 1, 2014.

Catherine, Duchess of Cambridge makes an official visit to Bletchley Park, June 18, 2014, in Bletchley, England.

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 Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348.

Catherine, Duchess of Cambridge is pictured with Prince George of Cambridge at the Cirencester Park Polo Club on June 15, 2014 in Cirencester, England.

Catherine, Duchess of Cambridge appears on the balcony of Buckingham Palace, during the Trooping The Colour parade, in central London, Saturday, June 14, 2014.

Catherine, Duchess of Cambridge, attends a garden party at Buckingham Palace in London on June 10, 2014.

Catherine Duchess of Cambridge is seen at the America's Cup event at the National Maritime Museum in London, June 10, 2014.

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 landings in Normandy.

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.

Catherine, Duchess of Cambridge arrives at the Portrait Gallery, April 24, 2014 in Canberra, Australia

Catherine, Duchess of Cambridge receives flowers from spectators at the Playford Civic Centre, April 23, 2014 in Adelaide, Australia.

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.

Catherine, Duchess of Cambridge arrives at St Andrew's Cathedral for Easter Sunday Service on April 20, 2014 in Sydney, Australia.

Catherine, Duchess of Cambridge visits Taronga Zoo on April 20, 2014 in Sydney, Australia.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge feed a tree kangaroo at Taronga Zoo on April 20, 2014 in Sydney, Australia.

Catherine, Duchess of Cambridge, and Prince William, Duke of Cambridge meet a Koala at Taronga Zoo on April 20, 2014 in Sydney, Australia.

Catherine, Duchess of Cambridge visits RAAF Base Amberley on April 19, 2014 in Brisbane, Australia.

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.

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 cockpit of a RAAF Super Hornet from 1 Squadron at RAAF Base Amberley, near Brisbane, Australia, Saturday, April 19, 2014.

Catherine, the Duchess of Cambridge, runs along the beach at Manly, on Sydney's north shore, April 18, 2014.

Catherine, Duchess of Cambridge meets with young surf lifesavers during a surf lifesaving event on Manly Beach, April 18, 2014, in Sydney.

Catherine, Duchess of Cambridge arrives at the Winmalee Guide Hall, April 17, 2014 in Winmalee, Australia.

Catherine, Duchess of Cambridge and Prince George of Cambridge arrive at Sydney Airport on a Australian Airforce 737 aircraft, April 16, 2014 in Sydney.

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.

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.

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.

Britain's Kate, the Duchess of Cambridge, smiles while attending a state reception at Government House in Wellington, New Zealand, April 10, 2014.

Catherine, Duchess of Cambridge attends a WW1 commemorative and Flying Day at Omaka Aviation Heritage Centre April 10, 2014 in Blenheim, New Zealand.

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.

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 care for children and families in New Zealand.

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.

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, 2014 in Wellington, New Zealand.

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.

The Duke and Duchess of Cambridge with their son Prince George and dog Lupo photographed at Kensington Palace, London, March 2014.

Catherine, Duchess of Cambridge attends the St Patrick's Day parade at Mons Barracks, March 17, 2014 in Aldershot, England.

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.

Catherine, Duchess of Cambridge leaves after opening the ICAP Art Room at Northolt High School in Ealing, London.

The Duchess of Cambridge attends The Portrait Gala 2014: Collecting To Inspire at National Portrait Gallery, Feb. 11, 2014 in London, England.

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, England, Dec. 25, 2013.

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.

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.

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.

Prince William and Catherine Duchess of Cambridge attend the Royal family Christmas lunch at Buckingham Palace, Dec. 18, 2013, in London.

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 of Cambridge is a patron of the museum.

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.

Catherine, Duchess Of Cambridge, holds a frog hand puppet visits the children's hospice Shooting Star House in London, Dec. 6, 2013.

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.

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 )

Catherine, Duchess of Cambridge is seen leaving Kensington Palace for the Diplomatic reception at Buckingham Palace, Dec. 3, 2013.

Catherine, Duchess of Cambridge attends the annual SportsAid dinner at Victoria Embankment Gardens, Nov. 28, 2013 in London.

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 designer Alice Temperley and presented the "One-to-Watch" award to 16-year-old shooter Amber Hill.

Catherine, Duchess of Cambridge arrives at Clifford Chance for a Place2Be forum at Canary Wharf, Nov. 20, 2013, in London.

Catherine, Duchess of Cambridge visits the Only Connect and ex-offenders projects, Nov. 19, 2013, in London.

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 those who have lost their lives serving in the Armed Forces.

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.

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 in central London, Nov. 7, 2013.

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 Philanthropic Initiatives on October 24, 2013 in London, England.

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.

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 the christening of the three month-old Prince George, Oct. 23, 2013. Prince William carries his son Prince George, as he arrives with his wife Catherine, Duchess of Cambridge.

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.

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.

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.

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 crème top, and skinny jeans, revealing how quickly the new mom has returned to her sleek and fit physique since Prince George's July 22 birth.

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 gave birth, July 22.

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 gave birt, July 22.

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 including Prince Harry and the Duchess of Cambridge joined in the celebration of Queen Elizabeth's birthday Saturday.

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 Southampton, England.

Catherine, Duchess of Cambridge attends a service marking the 60th anniversary of the Queen's coronation at Westminster Abbey, June 4, 2013 in London.

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.

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.

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, England.

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.

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 London, April 24, 2013.

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.

Britain's Duchess of Cambridge, attends the National Review of Queen's Scouts at Windsor Castle, near London, April 21, 2013.

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.

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 events at the 2014 Glasgow Commonwealth Games.

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 the scouts with a red, white and blue neckerchief around her neck.

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.

Kate Middleton, Duchess of Cambridge, arrives at the Clare Foundation in London, wearing a white wool coat, March 19, 2013.

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, Prince William was there for her to lean on as she freed herself.

Catherine, Duchess of Cambridge attends Day 4 of The Cheltenham Festival at Cheltenham Racecourse on March 15, 2013 in England.

A pregnant Kate Middleton met with children at Humberside Fire and Rescue during an official visit to Grimsby, England March 5, 2013.

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.

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 substance dependence.

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. 11, 2013.

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 critics say it looks nothing like her.

Prince William and Catherine, Duchess of Cambridge, attend the Eucharist at St. Marks Church in Englefield, Berkshire, England, Dec. 25, 2012.

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 Arena in London, Britain, on December 16, 2012. This is the first public engagement by the Duchess after her pregnancy has been announced.

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.

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 in their namesake city to open a new hospital.

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 with her gorgeous emerald-colored dress. But it was her fresh, new hairstyle that stole the show.

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.

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.

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 Cambridge attended St. Andrews for college, where she met Prince William. Middleton wore the dress to the "War Horse" premiere earlier this year.

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 funeral of his childhood nanny. Middleton's sister Pippa was reportedly seen catching up with the couple at the hotspot.

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. The Duchess bundled up in a Reiss coat as she toured the facilities and listened to her husband's speech.

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 magazine released topless photos of Kate.

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 of Middleton's sister Pippa. The Duchess wore a light blue dress by Erdem. The dress is the same one she wore in June while attending festivities to mark the Queen's Diamond Jubilee.

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 perfume on the dancers which is a sign of respect. Will and Kate are representing the Queen on their Diamond Jubilee tour through Singapore, Malaysia, the Solomon Islands and Tuvalu.

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 beaded necklaces before traveling in a war canoe to Tavanipupu. They walked barefoot as locals gave them a tour around the island.

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.

Britain's William and his wife Kate, the Duke and Duchess of Cambridge, leave the Cultural village in Honiara, Sept. 17, 2012.

Britain's Prince William, left, and wife Kate, the Duchess of Cambridge, right, pose for a photo in Honiara, Solomon Islands, Sept. 16, 2012.

Catherine, the Duchess of Cambridge, arrives with her husband Britain's Prince William at the airport in Honiara on Sept. 16, 2012.

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.

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 Sept. 14, 2012 in Kuala Lumpur, Malaysia.

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 Lumpur, Malaysia.

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'adzam Shah and Queen Haminah Hamidunat at the Istana Negara Palace in Kuala Lumpur Sept. 13.

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 help of her husband, Prince William, Kate laid a wreath of behalf of the Queen and Prince Philip.

Catherine, Duchess of Cambridge attends a cultural event in Queenstown on day 2 of their Diamond Jubilee tour on Sept. 12, 2012 in Singapore.

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.

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.

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.

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, the Solomon Islands and the tiny Pacific Island of Tuvalu on their nine day tour.

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.

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.

Catherine, Duchess of Cambridge, claps while watching track cycling during the 2012 Paralympic Games at the Velodrome in London, Aug. 30, 2012.

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.

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.

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 Stadium Aug. 12, 2012.

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.

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.

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 Harry visited met a number of athletes, including gold medal winning rower Sophie Hosking.

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, 2012 at the Copper Box hall in London. Croatia won 37-14.

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.

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 Track Cycling final during Day 6 of the London 2012 Olympic Games at Velodrome, Aug. 2, 2012 in London.

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.

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 Cambridge greeted British Prime Minister David Cameron as she attending an event to promote the U.K.'s GREAT Campaign.

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 white shirt while she watched as the Queen's granddaughter Zara Phillips competed at the event.

Catherine, Duchess of Cambridge attends the Eventing Cross Country Equestrian event of the London 2012 Olympic Games at Greenwich Park on July 30, 2012.

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 to John Hulse during a visit to Buckingham Palace in London, on Day 69 of the London 2012 Olympic Torch Relay, July 26, 2012.

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 26, 2012, in London. The opening ceremonies for the 2012 Summer Olympics were scheduled Friday, July 27, 2012.

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 necklace from her own wardrobe.

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 Championships at Wimbledon, England, Sunday, July 8, 2012. Kate is reportedly wearing the Joseph Vanessa dress which she previously wore when she visited Canada with Prince William.

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 carried a flash of Strathearn tartan in the shape of a folded scarf.

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 duchess is wearing a pleated cable-knit dress by Alexander McQueen.

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 22, 2012.

(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 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348.

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 in Tetbury, England.

Catherine, Duchess of Cambridge interacts with schoolchildren at an 'Expanding Horizons' Primary School camp in Kent, on June 17, 2012 in Wrotham, England.

Catherine, Duchess of Cambridge participated in several outdoor activities at the Widehorizons Margaret McMillan House in Kent, on June 17, 2012 in Wrotham, England.

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 London, Saturday, June 16, 2012.

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 leg of the Queen's Diamond Jubilee tour.

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 paired with her signature LK Bennett shoes to the nuptials of Princess Diana's niece and Prince William's cousin, Emily McCorquodale.

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.

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 lunch at Windsor Castle two weeks ago.

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.

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.

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 high-heeled wedge shoes.

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, Jenny Packham.

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 Claridge's hotel in London. Middleton wowed onlookers in a cream-colored gown, believed to be designed by Roland Mouret, which featured a bold slit straight up the middle.

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.

A guard faints during a St. Patrick's Day parade visit by Kate Middleton, duchess of Cambridge.

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 Daily Mail.