Photos of the Duke and Duchess of Cambridge and their children, Prince George and Princess Charlotte, through the years.
Prince William, left, Kate and Prince Harry pose
Prince William, left, Kate and Prince Harry pose while wearing charity headbands issued by The Royal Foundation of the Duke and Duchess of Cambridge and Prince Harry. The three royals are spearheading a campaign to encourage people to talk openly about mental health issues. (Credit: AP)
Prince William and Kate arrive at a
Prince William and Kate arrive at a "Service of Hope" at Westminster Abbey, two weeks after the March 22 London terror attack, in London, on Wednesday, April 5, 2017. (Credit: AP / Eddie Mulholland)
Prince William, left, Kate and Prince Harry stand
Prince William, left, Kate and Prince Harry stand together after arriving for a "Service of Hope" at Westminster Abbey, two weeks after the March 22 London terror attack, in London, on Wednesday, April 5, 2017. (Credit: AP / Matt Dunham)

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Kate, Duchess of Cambridge, is escorted by gallery
Kate, Duchess of Cambridge, is escorted by gallery director Nicholas Cullinan at the 2017 Portrait Gala, a fundraising event, at the National Portrait Gallery in London on March 28, 2017. (Credit: AP / Neil Hall)
Prince William visits a
Prince William visits a "Les Voisins in Action" event highlighting the strong ties between the young people of France and the UK during an official two-day visit to Paris on March 18, 2017. (Credit: Getty Images / Pool)
Catherine, Duchess of Cambridge, visits a
Catherine, Duchess of Cambridge, visits a "Les Voisins in Action" event highlighting the strong ties between the young people of France and the UK during an official two-day visit to Paris on March 18, 2017. (Credit: Getty Images / Pool)
Prince William, Duke of Cambridge, and Cambridge Duchess
Prince William, Duke of Cambridge, and Cambridge Duchess Kate Middleton attend the Six Nations tournament Rugby Union match between France and Wales at the Stade de France in Saint-Denis, outside Paris, on March 18, 2017. (Credit: AFP / Getty Images / CHRISTOPHE SIMON)
Kate, Duchess of Cambridge, and Prince William listen
Kate, Duchess of Cambridge, and Prince William listen to wounded French army members as they visit the Hotel des Invalides in Paris on Saturday, March 18, 2017. (Credit: AP / Gonzalo Fuentes)

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Prince William and Kate, Duchess of Cambridge, meet
Prince William and Kate, Duchess of Cambridge, meet with people near the Eiffel Tower in Paris on March 18, 2017. (Credit: AFP / Getty Images / MICHEL EULER)
Prince William and Kate pose for photographers in
Prince William and Kate pose for photographers in Trocadero Square in Paris, France, on March 18, 2017. (Credit: EPA / MICHEL EULER / POOL)
Prince William and Duchess Kate meet with France's
Prince William and Duchess Kate meet with France's President Francois Hollande in Paris on March 17, 2017. (Credit: AFP / Getty Images / THIBAULT CAMUS)
Britain's Prince William, Duke of Cambridge, and his
Britain's Prince William, Duke of Cambridge, and his wife Kate, Duchess of Cambridge, arrive for a dinner at the British Embassy in Paris on March 17, 2017. (Credit: AFP / Getty Images / ERIC FEFERBERG)
Prince William and Kate, Duchess of Cambridge, arrive
Prince William and Kate, Duchess of Cambridge, arrive for a dinner at the British Embassy in Paris on March 17, 2017. (Credit: AFP/Getty Images / ERIC FEFERBERG)

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Kate, Duchess of Cambridge, center, and the wife
Kate, Duchess of Cambridge, center, and the wife of Britain's ambassador to France Lord Ed Llewellyn, Anna, listen to Prince William during a reception at the British embassy in Paris on Friday, March 17, 2017. (Credit: AP / Ian Langsdon)
French President Francois Hollande, center, welcomes Prince William
French President Francois Hollande, center, welcomes Prince William and Kate at the Elysee Palace in Paris on Friday, March 17, 2017. (Credit: AP / Christophe Ena)
Prince William, Duke of Cambridge, helps children complete
Prince William, Duke of Cambridge, helps children complete a construction task as he launches the new Prince William Award with SkillForce in Abergavenny, Wales, on March 1, 2017. (Credit: Getty Images / Chris Jackson)
Prince William greets children as he launches the
Prince William greets children as he launches the new Prince William Award with SkillForce in Abergavenny, Wales, on March 1, 2017. (Credit: AFP/Getty Images / CHRIS JACKSON)
Kate, Duchess of Cambridge, smiles while talking to
Kate, Duchess of Cambridge, smiles while talking to a child during a visit to the Ronald McDonald House Evelina in London on Tuesday, Feb. 28, 2017. (Credit: AP / Jeremy Selwyn)
Duchess Kate receives a bouquet of flowers as
Duchess Kate receives a bouquet of flowers as she arrives at Ronald McDonald House Evelina in London on Tuesday, Feb. 28, 2017. (Credit: AP / Kirsty Wigglesworth)
Duchess Kate, Duchess of Cambridge, enters a reception
Duchess Kate, Duchess of Cambridge, enters a reception to mark the launch of the UK-India Year of Culture 2017 at Buckingham Palace in London on Monday, Feb. 27, 2017. (Credit: AP / Yui Mok)
Britain's Prince William, and Kate, Duchess of Cambridge,
Britain's Prince William, and Kate, Duchess of Cambridge, attend a reception to mark the launch of the UK-India Year of Culture 2017 at Buckingham Palace in London on Monday, Feb. 27, 2017. (Credit: AP / Yui Mok)
Kate, Duchess of Cambridge, plays pool during her
Kate, Duchess of Cambridge, plays pool during her visit to Action for Children project MIST, a child and adolescent mental health project that works with children who are living in care, in Torfaen, Wales, on Wednesday, Feb. 22, 2017. (Credit: AP / Paul Edwards)
Prince George leaves Christmas Day service at St
Prince George leaves Christmas Day service at St Mark's Church in Englefield, England, on Sunday, Dec. 25, 2016. (Credit: AP / Andrew Matthews)
Catherine, Duchess of Cambridge, and Princess Charlotte watch
Catherine, Duchess of Cambridge, and Princess Charlotte watch a man inflate a balloon at a children's party at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016. (Credit: AP / CHRIS WATTIE)
Catherine, Duchess of Cambridge, and Prince George attend
Catherine, Duchess of Cambridge, and Prince George attend a party at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016. (Credit: EPA / STR)
Prince George and Prince William attend a children's
Prince George and Prince William attend a children's party for Military families at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016. (Credit: Getty Images / Chris Jackson)
Prince William, Duchess Kate, Princess Charlotte and Prince
Prince William, Duchess Kate, Princess Charlotte and Prince George attend a children's party for Military families at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016. (Credit: Getty Images / Chris Jackson)
Princess Charlotte attends a party at Government House
Princess Charlotte attends a party at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016. (Credit: EPA / STR)
Prince George plays with bubbles at a children's
Prince George plays with bubbles at a children's party for Military families at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016. (Credit: Getty Images / Chris Jackson)
Prince William, Kate, Charlotte and George, attend a
Prince William, Kate, Charlotte and George, attend a party at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016. (Credit: Getty Images / Chris Jackson)
Prince George attends a children's party for Military
Prince George attends a children's party for Military families at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016. (Credit: Getty Images / Chris Jackson)
Princess Charlotte plays with a dog at a
Princess Charlotte plays with a dog at a children's party for Military families at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016. (Credit: Getty Images / Chris Jackson)
Kate, Duchess of Cambridge, holds an eagle feather
Kate, Duchess of Cambridge, holds an eagle feather given to her by a young girl as Prince William looks on during a welcoming ceremony in Carcross, Yukon, Canada, on Wednesday, Sept. 28, 2016. (Credit: AP / Jonathan Hayward)
Prince William, Duke of Cambridge and Catherine, Duchess
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, in Carcross, Yukon, Canada, on Sept. 28, 2016. (Credit: Getty Images / Chris Jackson)
Prince William and Catherine, the Duchess of Cambridge,
Prince William and Catherine, the Duchess of Cambridge, in Carcross, Yukon, Canada, on Sept. 28, 2016. (Credit: Getty Images / Pool)
Prince William and Kate meet with Canadian Prime
Prince William and Kate meet with Canadian Prime Minister Justin Trudeau and his wife Sophie at Immigrant Services Society of BC in Vancouver, Canada on Sept. 25, 2016. (Credit: Getty Images / Andrew Chin)
Prince William and Kate walk the factory floor
Prince William and Kate walk the factory floor as they visit Hayward Tyler in Luton where they presented the company with The Queen's Award for Enterprise and opened their newly built Centre of Excellence on Aug. 24, 2016. (Credit: AFP/Getty Images / CHRIS J RATCLIFFE)
Duchess Catherine and Prince George visit the Royal
Duchess Catherine and Prince George visit the Royal International Air Tattoo at RAF Fairford in Fairford, England on July 8, 2016. (Credit: Getty Images / RICHARD POHLE)
Prince William and Prince George during a visit
Prince William and Prince George during a visit to the Royal International Air Tattoo at RAF Fairford in Fairford, England on July 8, 2016. (Credit: Getty Images / Chris Jackson)
Prince William, Kate and Prince George during a
Prince William, Kate and Prince George during a visit to the Royal International Air Tattoo at RAF Fairford in Fairford, England on July 8, 2016. (Credit: Getty Images / Chris Jackson)
Britain's Princess Charlotte poses at Anmer Hall in
Britain's Princess Charlotte poses at Anmer Hall in Norfolk, England, in an undated photo released on Sunday, May 1, 2016. (Credit: Kate, the Duchess of Cambridge / Kensington Palace / AP)
Britain's Princess Charlotte poses at Anmer Hall in
Britain's Princess Charlotte poses at Anmer Hall in Norfolk, England, in an undated photo released on Sunday, May 1, 2016. (Credit: Kate, the Duchess of Cambridge / Kensington Palace / AP)
Britain's Princess Charlotte poses at Anmer Hall in
Britain's Princess Charlotte poses at Anmer Hall in Norfolk, England, in an undated photo released on Sunday, May 1, 2016. (Credit: Kate, the Duchess of Cambridge / Kensington Palace / AP)
Princess Charlotte poses at Anmer Hall in Norfolk,
Princess Charlotte poses at Anmer Hall in Norfolk, England, in an undated photo released on Sunday, May 1, 2016. (Credit: Kate, the Duchess of Cambridge / Kensington Palace / AP)
Britain's Prince William and Kate Duchess of Cambridge
Britain's Prince William and Kate Duchess of Cambridge enjoy a snow ball fight as they enjoy a short private break skiing in the French Alps on Thursday, March 3, 2016. (Credit: John Stillwell / Pool via AP)
Prince William and Princess Charlotte in the French
Prince William and Princess Charlotte in the French Alps on Thursday, March 3, 2016. (Credit: John Stillwell / Pool via AP)
Britain's Prince William and Duchess of Cambridge, with
Britain's Prince William and Duchess of Cambridge, with their children, Princess Charlotte and Prince George in the French Alps on Thursday, March 3, 2016. (Credit: John Stillwell / Pool via AP)
Prince William Kate with their children, Princess Charlotte
Prince William Kate with their children, Princess Charlotte and Prince George, enjoying a skiing vacation in the French Alps on Thursday, March 3, 2016. (Credit: John Stillwell / Pool via AP)
Prince George on his first day at the
Prince George on his first day at the Westacre Montessori nursery school near Sandringham in Norfolk, eastern England, on Wednesday, Jan. 6, 2016. (Credit: Getty Images/ Getty Images, AFP)
Catherine, Duchess of Cambridge, Britain's Prince William, and
Catherine, Duchess of Cambridge, Britain's Prince William, and their two children Prince George and Princess Charlotte at Kensington Palace in London in late October 2015. (Credit: Getty Images/ Chris Jelf)
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