Photos of the Duke and Duchess of Cambridge and their children, Prince George and Princess Charlotte, through the years.
Katherine, the Duchess of Cambridge, and Prince William,
Katherine, the Duchess of Cambridge, and Prince William, the Duke of Cambridge, attend the Queen's birthday party at the British ambassadorial residence in Berlin on July 19, 2017. (Credit: Getty Images / Chris Jackson)
Prince William, Duke of Cambridge, and Catherine, Duchess
Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, chat with Nils Juergens of Claerchen's as they arrive at a reception at Claerchen's Ballhaus dance hall following a day in Heidelberg on the second day of the royal visit to Germany on July 20, 2017. (Credit: Getty Images / Sean Gallup)
Britain's Prince William, Duke of Cambridge and his
Britain's Prince William, Duke of Cambridge and his wife Kate, Duchess of Cambridge, take a walk on the Old Bridge in the historic center of Heidelberg, southern Germany on July 20, 2017. (Credit: AFP / Getty Images / Daniel Roland)

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Prince William, Duke of Cambridge, and Catherine, Duchess
Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, depart after a visit to the Maritime Museum to celebrate the joint UK-German year of science, which for 2017 is focused on oceans, during an official visit to Poland and Germany in Hamburg, Germany, on July 21, 2017. (Credit: Getty Images / Chris Jackson)
Britain's Dutchess of Cambridge, Catherine, arrives to visit
Britain's Dutchess of Cambridge, Catherine, arrives to visit the Elbphilharmonie concert hall in Hamburg, northern Germany, on July 21, 2017. (Credit: AFP / Getty Images / Patrik Stollarz)
Prince William, Duke of Cambridge, and Catherine, Duchess
Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, make a toast at the queen's birthday garden party at the Orangery, Lazienki Park in Warsaw, on day 1 of their official visit to Poland on July 17, 2017. (Credit: Getty Images / Pool)
Britain's Prince William, Duke of Cambridge, far right,
Britain's Prince William, Duke of Cambridge, far right, and Catherine, Duchess of Cambridge, far left, during a meeting with German President Frank-Walter Steinmeier, right, and his wife Elke Buedenbender, left, at the Bellevue Palace in Berlin, Germany, July 19, 2017. (Credit: EPA / Steffens / Pool)
Andreas Goebes of the bakers guild Heidelberg, right,
Andreas Goebes of the bakers guild Heidelberg, right, watches as Kate, the Duchess of Cambridge, and Britain's Prince William, the Duke of Cambridge, shape pretzels during their visit to the market in the historic center of the southern German town of Heidelberg on July 20, 2017. (Credit: AFP / Getty Images / Thomas Kienzle)

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Britain's Prince William and his wife Kate, the
Britain's Prince William and his wife Kate, the Duchess of Cambridge, talk with German President Frank-Walter Steinmeier and his wife, Elke Buedenbender, as they sit in the garden of the presidential residence at Bellevue Palace in Berlin on Wednesday, July 19, 2017. (Credit: AP / Fabrizio Bensch)
Prince William, Duke of Cambridge, and Catherine, Duchess
Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge visit the Gdansk Shakespeare Theatre in Poland during an official visit to Poland on July 18, 2017. (Credit: Getty Images Europe / Chris Jackson)
The Duke and Duchess of Cambridge, William and
The Duke and Duchess of Cambridge, William and Kate. take a tour of a traditional German market in the Central Square of Heidelberg, Germany, on day two of their official visit to the country on July 20, 2017. (Credit: Getty Images / Chris Jackson)
Prince William, Duke of Cambridge, and Catherine, Duchess
Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge don white lab coats during their visit to the German Cancer Research Institute in Heidelberg, on day two of their official visit to Germany on July 20, 2017. (Credit: Getty Images / Pool)
The Duke and Duchess of Cambridge, William and
The Duke and Duchess of Cambridge, William and Kate, attend a Queen Elizabeth II birthday garden party at the residence of the British Ambassador in Berlin on July19 , 2017. (Credit: EPA / Matthias Nareyek / Pool)

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Children welcome Kate, the Duchess of Cambridge, in
Children welcome Kate, the Duchess of Cambridge, in front of the presidential palace, in Warsaw, Poland, Monday, July 17, 2017. (Credit: AP / Alik Keplicz)
Prince William, Duke of Cambridge, and Kate, Duchess
Prince William, Duke of Cambridge, and Kate, Duchess of Cambridge, watch the Gentlemen's Singles final between Roger Federer of Switzerland and Marin Cilic of Croatia during the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on July 16, 2017, in London. (Credit: Getty Images / Clive Brunskill)
The Duke and Duchess of Cambridge, William and
The Duke and Duchess of Cambridge, William and Kate, arrive with their children, Princess Charlotte and Prince George, on day one of their official visit to Warsaw, Poland, on July 17, 2017. (Credit: Getty Images / Chris Jackson)
The Duke and Duchess of Cambridge, William and
The Duke and Duchess of Cambridge, William and Kate, with their children arrive at Berlin Tegel Airport during an official visit to Germany on July 19, 2017. (Credit: Getty Images / Pool)
Prince William, Duke of Cambridge, and Kate, Duchess
Prince William, Duke of Cambridge, and Kate, Duchess of Cambridge visit the Gdansk Shakespeare Theatre in Gdansk, Poland, on July 18, 2017. (Credit: Getty Images Europe / Chris Jackson)
Katherine, the Duchess of Cambridge, and Prince William,
Katherine, the Duchess of Cambridge, and Prince William, the Duke of Cambridge, attend the Queen's birthday party at the British ambassadorial residence in Berlin on July 19, 2017. (Credit: Getty Images / Chris Jackson)
The Duke and Duchess of Cambridge, William and
The Duke and Duchess of Cambridge, William and Kate, arrive with their children at Berlin Tegel Airport on July 19, 2017. (Credit: Getty Images / Chris Jackson)
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)
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)
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)
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)
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