Karwai Tang/WireImage via Getty Images
  • 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.
    Hannah Mckay/Reuters
  • Catherine, The Duchess of Cambridge convenes an early intervention for children and families symposium at Royal Society of Medicine, March 21, 2018, in London.
    Karwai Tang/WireImage via Getty Images
  • 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.
    Andrew Parsons/Reuters
  • Duchess of Cambridge Kate Middleton in Stockholm, Sweden, Jan. 31, 2018.
    Andrew Parsons/i-Images/Polaris
  • Duchess Kate goes for a test drive

    Duchess Kate goes for a test drive
    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.
    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, England, Nov. 22, 2017.
    Paul Ellis/AFP/Getty Images
  • Duchess Kate dances with Paddington Bear

    Duchess Kate dances with Paddington Bear
    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.
    Jonathan Brady/WPA Pool via Getty Images
  • Britain's Prince William, Catherine Duchess of Cambridge celebrate World Mental Health Day

    Britain's Prince William, Catherine Duchess of Cambridge celebrate World Mental Health Day
    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.
    Heathcliff O'Malley/Reuters
  • Duchess Kate twists up a pretzel in Germany

    Duchess Kate twists up a pretzel in Germany
    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.
    Thomas Kienzle/AP
  • Duchess Kate and Prince William visit Germany

    Duchess Kate and Prince William visit Germany
    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.
    Marijan Murat/dpa/AP
  • Duchess Kate gets into the spirit at Wimbledon

    Duchess Kate gets into the spirit at Wimbledon
    The Duchess of Cambridge watches Andy Murray beat Alexander Bublik on Day one of the 2017 Wimbledon Tennis Championships, July 3, 2017, London.
    Andrew Parsons/i-Images/Polaris
  • Kate, Duchess of Cambridge, takes in Wimbledon

    Kate, Duchess of Cambridge, takes in Wimbledon
    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.
    Gareth Fuller/WPA Pool/Getty Images
  • The Countess of Wessex, Sophie, accidentally falls onto Kate, Duchess of Cambridge, at Ascot

    The Countess of Wessex, Sophie, accidentally falls onto Kate, Duchess of Cambridge, at Ascot
    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.
    Jason Dawson/Nunn Syndication/Polaris
  • The royal family steps out in London

    The royal family steps out in London
    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.
    Victoria Jones/WPA Pool/Getty Images
  • Duchess Kate steps out in Luxembourg

    Duchess Kate steps out in Luxembourg
    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.
    Samir Hussein/WireImage via Getty Images
  • Duchess Kate steps out in Luxembourg

    Duchess Kate steps out 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.
    Toby Melville/Reuters
  • Duchess Kate feeds a lamb

    Duchess Kate feeds a lamb
    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.
    Neil Munns/EPA
  • Prince William, Duchess Kate and Prince Harry step out in England

    Prince William, Duchess Kate and Prince Harry step out in England
    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.
    Max Mumby/Indigo/Getty Images
  • Prince William and Duchess Kate attend Easter Sunday service

    Prince William and Duchess Kate attend Easter Sunday service
    Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend Easter Sunday service at Windsor Castle in Windsor, England, April 16, 2017.
    Alan Davidson/SilverHub/REX/Shutterstock
  • Duchess Kate takes in a play in London

    Duchess Kate takes in a play in London
    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.
    Dave Benett/Getty Images
  • Duchess Kate attends a gala in London

    Duchess Kate attends a gala in London
    Catherine, Duchess of Cambridge, arrives at the 2017 Portrait Gala at the National Portrait Gallery in London, March 28, 2017.
    Stephen Lock/i-Images/Polaris
  • Duchess Kate celebrates St. Patrick's Day

    Duchess Kate celebrates St. Patrick's Day
    Catherine, Duchess of Cambridge, at Cavalry Barracks, Hounslow, during the Irish Guards St. Patrick's Day Parade, in London, March 17, 2017.
    Rupert Hartley/REX/Shutterstock
  • Duchess Kate visits a hospital

    Duchess Kate visits a hospital
    Catherine, Duchess of Cambridge visits the Ronald McDonald House Evelina London, Feb. 28, 2017, in London.
    Danny Martindale/WireImage/Getty Images
  • Duchess Kate met with children at her new charity

    Duchess Kate met with children at her new charity
    Catherine, Duchess of Cambridge visits MIST, a child and adolescent mental health project, Feb. 22, 2017 in Pontypool, Wales.
    WireImage
  • Prince William and Duchess Kate Attend the BAFTAs

    Prince William and Duchess Kate Attend the BAFTAs
    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.
    Daniel Leal-Olivas/AFP/Getty Images
  • Duchess Kate Visits Parenting Center in London

    Duchess Kate Visits Parenting Center in London
    Catherine, Duchess of Cambridge arrives for a visit to the CBUK Stratford, Jan. 11, 2017, in London, England.
    Mark Cuthbert/UK Pres via Getty Images
  • Duchess Kate and Prince William Take Their Children to Church

    Duchess Kate and Prince William Take Their Children to Church
    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.
    Andrew Matthews/Pool/Reuters
  • The Royal Family Attend the Mix Christmas Party

    The Royal Family Attend the Mix Christmas Party
    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.
    Chris Jackson/Getty Images
  • Duchess Kate Attends Cub Scout Meeting

    Duchess Kate Attends Cub Scout Meeting
    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.
    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.
    i-Images, PacificCoastNews
  • Princess Kate Wears Florals to a Tea Party

    Princess Kate Wears Florals to a Tea Party
    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.
    Yui Mok/AP Photo
  • Princess Kate Shows Support for Veterans

    Princess Kate Shows Support for Veterans
    The Duchess of Cambridge attends the Remembrance Sunday service at The Cenotaph in London, Nov. 13, 2016.
    Stephen Lock/i-Images / Polaris
  • Princess Kate Sports a Blue Coat

    Princess Kate Sports a Blue Coat
    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.
    Richard Pohler/Pool/AFP/Getty Images
  • Duchess Kate Stuns in White at Gala

    Duchess Kate Stuns in White at Gala
    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.
    Alastair Grant/AP Photo
  • Duchess Kate Steps Out in Manchester

    Duchess Kate Steps Out in Manchester
    Catherine Duchess of Cambridge is seen at The National Football Museum in Manchester, Oct. 14, 2016.
    Tim Rooke/REX/Shutterstock
  • Catherine, Duchess of Cambridge visits Bouwkeet, the social Makerspace of Bospolder-Tussendijken on Oct. 11, 2016 in The Hague, Netherlands.
    Samir Hussein/Getty Images
  • Duchess Kate Visits the Netherlands

    Duchess Kate Visits the Netherlands
    Kate, the Duchess of Cambridge, is greeted by Dutch King Willem-Alexander upon her arrival in The Hague, Netherlands, Oct. 11, 2016.
    Peter Dejong/AP Photo
  • Duchess Kate Steps Out in London

    Duchess Kate Steps Out in London
    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.
    Tim Rooke/REX/Shutterstock
  • Duchess Kate Smiles in Fabulous Printed Dress

    Duchess Kate Smiles in Fabulous Printed Dress
    Catherine, Duchess of Cambridge arrives by Sea Plane in Vancouver, Sept. 25, 2016 in Vancouver, Canada.
    Samir Hussein/Getty Images
  • Princess Kate Smiles After Meeting With Young People

    Princess Kate Smiles After Meeting With Young People
    Catherine, Duchess of Cambridge leaves Stewards Academy, Sept. 16, 2016, in Harlow, England.
    Getty Images
  • Duchess Kate Sports a Navy Blazer

    Duchess Kate Sports a Navy Blazer
    Catherine, Duchess of Cambridge is seen at Tresco Abbey Gardens during a visit to Cornwall, Sept. 2, 2016, in Tresco, England.
    GC Images/Getty Images
  • William and Kate Step Out in Cornwall

    William and Kate Step Out in Cornwall
    Britain's Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, begin their visit to Cornwall in Truro, Sept. 1, 2016.
    FameFlynetUK/FameFlynet Pictures
  • Duchess Kate Steps Out in Red Dress

    Duchess Kate Steps Out in Red Dress
    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.
    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.
    PA Wire/Press Association Images
  • Princess Kate Attends the America's Cup World Series

    Princess Kate Attends the America's Cup World Series
    Catherine, Duchess of Cambridge visits Land Rover BAR boat shed at the America's Cup World Series, July 24, 2016, in Portsmouth, England.
    Henry Browne/Getty Images
  • Duchess Kate Cheers on Andy Murray at Wimbledon

    Duchess Kate Cheers on Andy Murray at Wimbledon
    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.
    Karwai Tang/WireImage
  • Duchess Kate Attends an Air Show With Prince George

    Duchess Kate Attends an Air Show With Prince George
    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.
    Samir Hussein/WireImage
  • Duchess Kate Attends Wimbledon

    Duchess Kate Attends Wimbledon
    Catherine, Duchess of Cambridge, stands in the royal box watching the ladies semifinals at Wimbledon Tennis Championships in London, July 7, 2016.
    Andrew Parsons/Polaris
  • Duchess Kate Stuns in a Cream Gown

    Duchess Kate Stuns in a Cream Gown
    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.
    Getty Images
  • Duchess Kate Attends a Vigil With Prince William and Prince Harry

    Duchess Kate Attends a Vigil With Prince William and Prince Harry
    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.
    Splash News
  • Duchess Kate Attends a Vigil With Prince William and Prince Harry

    Duchess Kate Attends a Vigil With Prince William and Prince Harry
    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.
    Splash News
  • Duchess Kate Stuns in a Dress She First Wore in 2011

    Duchess Kate Stuns in a Dress She First Wore in 2011
    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.
    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.
    Philip Toscano/AP Photo
  • The Royal Family Greets Well-Wishers at Buckingham Palace

    The Royal Family Greets Well-Wishers at Buckingham Palace
    (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.
    Ben A. Pruchnie/Getty Images
  • Duchess Kate Celebrates the Queen's 90th

    Duchess Kate Celebrates the Queen's 90th
    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.
    Jeff Spicer/Getty Images
  • Duchess Kate Steps Out in a Cut-Out Dress

    Duchess Kate Steps Out in a Cut-Out Dress
    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.
    Eddie Mulholland-WPA Pool/Getty Images
  • Duchess Kate and Prince William Attend a Garden Party

    Duchess Kate and Prince William Attend a Garden Party
    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.
    Dan Kitwood/WPA Pool/Getty Images
  • Duchess Kate Middleton Looks Lovely in Green

    Duchess Kate Middleton Looks Lovely in Green
    Catherine, Duchess of Cambridge attends Chelsea Flower Show press day at Royal Hospital Chelsea, May 23, 2016 in London.
    Mark Cuthbert/UK Press via Getty Images
  • Duchess Kate Middleton Looks Regal in White

    Duchess Kate Middleton Looks Regal in White
    Catherine, Duchess of Cambridge, patron of the 1851 Trust, arrives at Land Rover BAR, May 20, 2016 in Portsmouth, England.
    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.
    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.
    Mark Cuthbert/UK Press via Getty Images
  • Duchess Kate and Princes William and Harry Launch Their Health Initiative

    Duchess Kate and Princes William and Harry Launch Their Health Initiative
    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.
    Robin Nunn/Nunn Syndication/Polaris
  • Duchess Kate Attends Her Portrait Unveiling

    Duchess Kate Attends Her Portrait Unveiling
    Catherine, Duchess of Cambridge is seen leaving the "Vogue 100: A Century Of Style" exhibition at National Portrait Gallery, May 4, 2016, in London.
    Danny Martindale/WireImage/Getty Images
  • Duchess Kate Plays Cricket in Wedges

    Duchess Kate Plays Cricket in Wedges
    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.
    Tim Rooke/REX/Shutterstock
  • Prince William and Duchess Kate Attend a Bollywood Bash

    Prince William and Duchess Kate Attend a Bollywood Bash
    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.
    Samir Hussein/Getty images
  • Prince William and Duchess Kate Step Out Ahead of Their India Trip

    Prince William and Duchess Kate Step Out Ahead of Their India Trip
    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.
    WPA Pool/Getty Images
  • Duchess Kate Makes Steps Out in Blue for a Charity

    Duchess Kate Makes Steps Out in Blue for a Charity
    Catherine, Duchess of Cambridge opens the new EACH Charity Shop, March 18, 2016, in Holt, Norfolk.
    Mark Cuthbert/UK Press via Getty Images
  • Duchess Kate and Princes William and Harry Head to Westminster Abbey

    Duchess Kate and Princes William and Harry Head to Westminster Abbey
    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.
    Leon Neal/AFP/Getty Images
  • Kate Middleton Steps Out in London

    Kate Middleton Steps Out in London
    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.
    James Whatling/Splash News
  • Kate Middleton Visits St Thomas' Hospital

    Kate Middleton Visits St Thomas' Hospital
    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.
    Toby Melville /Pool Photo via AP Photo
  • The Royal Family's Sweet Vacation Photos

    The Royal Family's Sweet Vacation Photos
    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.
    John Stillwell/PA/EPA
  • The Royal Family's Sweet Vacation Photos

    The Royal Family's Sweet Vacation Photos
    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.
    John Stillwell/PA/EPA
  • The Royal Family's Sweet Vacation Photos

    The Royal Family's Sweet Vacation Photos
    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.
    John Stillwell/PA/EPA
  • The Royal Family's Sweet Vacation Photos

    The Royal Family's Sweet Vacation Photos
    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.
    John Stillwell/PA/EPA
  • Kate Middleton Is Gorgeous in Green

    Kate Middleton Is Gorgeous in Green
    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.
    Andrew Milligan/Getty Images
  • Duchess Catherine Goes to Work as a Journalist

    Duchess Catherine Goes to Work as a Journalist
    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.
    Chris Jackson/WPA Pool/Getty Images
  • Duchess Kate Stuns in Blue

    Duchess Kate Stuns in Blue
    Catherine, Duchess of Cambridge attends the 75th anniversary of the RAF Air Cadets at St Clement Danes Church in London, Feb. 7, 2016.
    Splash News
  • Duchess Kate and Prince William Attend Church

    Duchess Kate and Prince William Attend Church
    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.
    Max Mumby/Indigo/Getty Images
  • Duchess Kate Turns 34

    Duchess Kate Turns 34
    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.
    Chris Jackson/AFP/Getty Images
  • Duchess Kate Steps Out in Tweed

    Duchess Kate Steps Out in Tweed
    Members of the Royal Family attend the morning service at the Church of St Mary Magdalene in Sandringham, Norfolk, Dec. 27, 2015.
    James Whatling/Splash
  • Duchess Kate Celebrates Christmas in Green

    Duchess Kate Celebrates Christmas in Green
    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.
    Matt Dunham/AP Photo
  • See the Royal Family's Christmas Card

    See the Royal Family's Christmas Card
    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.
    Chris Jelf/Kensington Palace/Getty Images
  • Kate Middleton Steps out in Red

    Kate Middleton Steps out in Red
    Catherine, Duchess of Cambridge attends the Anna Freud Centre Family School Christmas Party at Anna Freud Centre, Dec. 15, 2015, in London.
    Mark Cuthbert/Getty Images
  • Duchess Kate Shows Off Her Shorter Hairdo

    Duchess Kate Shows Off Her Shorter Hairdo
    Catherine, Duchess of Cambridge visits Action on Addiction,Warminster, Wiltshire, Dec. 10, 2015.
    Tim Rooke/REX Shutterstock
  • Kate Middleton Has a Laugh for Charity

    Kate Middleton Has a Laugh for Charity
    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.
    Jeremy Selwyn/WPA Pool/Getty Images
  • Duchess Kate Is Regal in a Diamond Tiara

    Duchess Kate Is Regal in a Diamond Tiara
    Kate Middleton, the Duchess of Cambridge, attends the Diplomatic Reception at Buckingham Palace on Dec. 8, 2015 in London.
    Mark Cuthbert/UK Press via Getty Images
  • Duchess Kate Accepts Flowers From a Young Well-Wisher

    Duchess Kate Accepts Flowers From a Young Well-Wisher
    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.
    Phil Noble/WPA Pool/Getty Images
  • Duchess Kate Stuns in a Smart Grey Dress

    Duchess Kate Stuns in a Smart Grey Dress
    Catherine, Duchess of Cambridge attends Place2Be Headteacher Conference at Bank of America Merrill Lynch in London, Nov. 18, 2015.
    Danny Martindale/Getty Images
  • Prince William and Duchess Kate Pay Their Respects to Victims of the Paris Attacks

    Prince William and Duchess Kate Pay Their Respects to Victims of the Paris Attacks
    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.
    Jonathan Brady/AP Photo
  • Duchess Kate Dazzles in a Floral Gown

    Duchess Kate Dazzles in a Floral Gown
    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.
    Chris Jacksoni/PA Wire/AP Photo
  • Duchess Kate Goes Ladylike in Grey

    Duchess Kate Goes Ladylike in Grey
    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.
    Karwai Tang/WireImage/Getty Images
  • Duchess Kate Attends 'Spectre' Premiere

    Duchess Kate Attends 'Spectre' Premiere
    The Duchess of Cambridge arrives at the World Premiere of "Spectre" at the Royal Albert Hall in central London, Oct. 26, 2015.
    Joel Ryan/Invision/AP Photo
  • Duchess Kate Steps Out in Sky-High Stilettos

    Duchess Kate Steps Out in Sky-High Stilettos
    Catherine, Duchess of Cambridge arrives at Charities Forum Day, BAFTA in London, Oct. 26, 2015.
    Tim Rooke/REX Shutterstock
  • Duchess Kate Steps Out in Royal Blue

    Duchess Kate Steps Out in Royal Blue
    Catherine, Duchess of Cambridge visits the Dundee Rep Theatre, Oct. 23, 2015 in Dundee, Scotland.
    Mark Cuthbert/UK Press/Getty Images
  • Prince William and Duchess Kate Make a Stylish Appearance Together

    Prince William and Duchess Kate Make a Stylish Appearance Together
    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.
    Max Mumby/Indigo/Getty Images
  • Duchess Kate Visits a Prison

    Duchess Kate Visits a Prison
    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.
    Andrew Matthews/Getty Images
  • Duchess Kate Shows Off Her New Hairstyle

    Duchess Kate Shows Off Her New Hairstyle
    Catherine, Duchess of Cambridge visits the Anna Freud Centre, Sept. 17, 2015, in London.
    Mark Cuthbert/UK Press/Getty Images
  • Prince William and Duchess Kate Head to Church in Scotland

    Prince William and Duchess Kate Head to Church in Scotland
    The Duke and Duchess of Cambridge, Kate Middleton and Prince William go the Crathie Kirk for Sunday morning prayers in Scotland, Sept. 13, 2015.
    Jesal/Tanna/Splash News
  • Kate Middleton Looks Racy at Visit to America's Cup

    Kate Middleton Looks Racy at Visit to America's Cup
    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.
    Chris Jackson/Getty Images
  • Duchess Kate Goes to Wimbledon

    Duchess Kate Goes to Wimbledon
    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.
    Karwai Tang/Getty Images
  • Duchess Kate Goes to Wimbledon

    Duchess Kate Goes to Wimbledon
    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.
    Karwai Tang/Getty Images
  • Duchess Kate Takes Princess Charlotte to Her Christening

    Duchess Kate Takes Princess Charlotte to Her Christening
    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.
    Chris Jackson/AP Photo
  • Duchess Kate Looks Radiant at Princess Charlotte's Christening

    Duchess Kate Looks Radiant at Princess Charlotte's Christening
    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.
    Chris Jackson/Getty Images
  • Duchess Kate and Prince George Enjoy a Polo Match

    Duchess Kate and Prince George Enjoy a Polo Match
    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.
    Chris Jackson/Getty Images
  • Kate Middleton Goes for a Drive

    Kate Middleton Goes for a Drive
    Kate Middleton is spotted driving a Range Rover out of Buckingham Palace in London on April 28, 2015.
    MODE/AKM-GSI
  • Pregnant Kate Steps Out In Polka Dots

    Pregnant Kate Steps Out In Polka Dots
    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.
    Alex Lentati-WPA Pool/Getty Images
  • Pregnant Kate Arrives at a St. Patrick's Day Parade

    Pregnant Kate Arrives at a St. Patrick's Day Parade
    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.
    Kirsty Wigglesworth/AP Photo
  • Prince William Steps Out with Duchess Kate

    Prince William Steps Out with Duchess Kate
    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.
    Chris Jackson/Getty Images
  • Duchess Kate Visits 'Downton Abbey'

    Duchess Kate Visits 'Downton Abbey'
    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.
    Chris Jackson/ WPA Pool/Getty Images
  • Pregnant Kate Wears a Wild Print

    Pregnant Kate Wears a Wild Print
    Catherine, Duchess of Cambridge visits the Turner Contempary on March 11, 2015 in Margate, England.
    Karwai Tang/WireImage/Getty Images
  • Kate Looks Pretty in Pink

    Kate Looks Pretty in Pink
    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.
    Lefteris Pitarakis/AP Photo
  • Duchess Kate Shows Off Her Growing Bump

    Duchess Kate Shows Off Her Growing Bump
    Catherine Duchess of Cambridge is seen leaving The Goring Hotel in Victoria, London, March 2, 2015.
    Ben Cawthra/SIPA
  • Duchess Kate Shows Off Her Baby Bump in Blue

    Duchess Kate Shows Off Her Baby Bump in Blue
    Catherine, Duchess of Cambridge, unveils a plaque as she visits the 'Emma Bridgewater'� pottery factory, Feb. 18, 2015, in Staffordshire, England.
    Oli Scarff/WPA Pool/Getty Images
  • Duchess Kate Shows Off Her Growing Bump in a White Coat

    Duchess Kate Shows Off Her Growing Bump in a White Coat
    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.
    Chris Jackson/Getty Images
  • Pregnant Duchess Kate Bundles Up in Blue

    Pregnant Duchess Kate Bundles Up in Blue
    Catherine, Duchess of Cambridge arrives to formally open the Kensington Leisure Centre, Jan. 19, 2015, in London.
    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 of Kensington.
    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.
    Lefteris Pitarakis/Getty Images
  • Duchess Kate Steps Out in Hot Pink

    Duchess Kate Steps Out in Hot Pink
    Catherine, Duchess of Cambridge visits the Stephen Lawrence Centre in Deptford, March 27, 2015, in London.
    Neil Mockford/Alex Huckle
  • Duchess Kate Steps Out With a Smile

    Duchess Kate Steps Out With a Smile
    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.
    Lefteris Pitarakis/AP Photo
  • Happy 33rd Birthday, Duchess Kate!

    Happy 33rd Birthday, Duchess Kate!
    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.
    Jason DeCrow/Getty Images
  • Kate Middleton Looks Radiant on Christmas Day

    Kate Middleton Looks Radiant on Christmas Day
    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.
    Paul Ellis/AFP/Getty Images
  • Kate Middleton and Prince William on Christmas Day

    Kate Middleton and Prince William on Christmas Day
    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.
    Matt Dunham/AP Photo
  • Kate Middleton Learns Sign Language

    Kate Middleton Learns Sign Language
    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.
    Ben Stansall/AFP/Getty Images
  • Duchess Kate Wears a Hoodie to Hang Out with Beaver Scouts

    Duchess Kate Wears a Hoodie to Hang Out with Beaver Scouts
    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.
    Ben Stansall/Pool/AFP/Getty Images
  • Kate Middleton Attends a Charity Launch in Red

     Kate Middleton Attends a Charity Launch in Red
    Catherine, Duchess of Cambridge arrives at East Anglia's Children's Hospices appeal launch at Norfolk Showground, Nov. 25, 2014, in Norwich, England.
    Mark Cuthbert/UK Press/Getty Images