Kate, Duchess of Cambridge, is lifted up as she joins a rugby training session in her new role as patron of the Rugby Football Union, in Twickenham Stadium, in London, Feb. 2, 2022.

Prince William and Catherine Duchess of Cambridge leave the hospital with their newborn baby boy at the Lindo Wing, St Mary's Hospital, London, April 23, 2018. <br><br> Kate Middleton departed St. Mary’s Hospital for Kensington Palace just hours after giving birth, posing upon her departure with William and their son. <br><br> Prince William and Duchess Kate have announced the name of their third child: Louis Arthur Charles. The newborn, the third child of William and Kate, weighed 8 pounds, 7 ounces at birth. He was born at 11:01 a.m., local time.

Catherine, The Duchess of Cambridge convenes an early intervention for children and families symposium at Royal Society of Medicine, March 21, 2018, in London.

Britain's Catherine, Duchess of Cambridge attends the presentation of Shamrock to the 1st Battalion Irish Guards, at a St Patrick's Day parade at Cavalry Barracks in Hounslow, London, March 17, 2018.

Duchess of Cambridge Kate Middleton in Stockholm, Sweden, Jan. 31, 2018.

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.

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, England, Nov. 22, 2017.

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.