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LONDON, UNITED KINGDOM - MAY 13: Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge are seen at a tea party in the grounds of Buckingham Palace to honour the children of those who have died serving in the armed forces on May 13, 2017 in London, England. (Photo by Andrew Parsons - WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - MAY 13: Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge are seen at a tea party in the grounds of Buckingham Palace to honour the children of those who have died serving in the armed forces on May 13, 2017 in London, England. (Photo by Andrew Parsons - WPA Pool/Getty Images)

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LONDON, UNITED KINGDOM - MAY 13: Catherine, Duchess of Cambridge speaks to children as she along with Prince William, Duke of Cambridge and Prince Harry host Party at The Palace, they are hosting a special party in the grounds of Buckingham Palace to honour the children of those who have died serving in the armed forces on May 13, 2017 in London, England. . (Photo by Andrew Parsons - WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - MAY 13: Catherine, Duchess of Cambridge speaks to children as she along with Prince William, Duke of Cambridge and Prince Harry host Party at The Palace, they are hosting a special party in the grounds of Buckingham Palace to honour the children of those who have died serving in the armed forces on May 13, 2017 in London, England. .  (Photo by Andrew Parsons - WPA Pool/Getty Images)

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LONDON, UNITED KINGDOM - MAY 13: Prince Harry, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge host Party at The Palace, they are hosting a special party in the grounds of Buckingham Palace to honour the children of those who have died serving in the armed forces on May 13, 2017 in London, England. . (Photo by Andrew Parsons - WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - MAY 13: Prince Harry, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge host Party at The Palace, they are hosting a special party in the grounds of Buckingham Palace to honour the children of those who have died serving in the armed forces on May 13, 2017 in London, England. .  (Photo by Andrew Parsons - WPA Pool/Getty Images)

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LONDON, UNITED KINGDOM - MAY 13: Catherine, Duchess of Cambridge meets guests at a tea party in the grounds of Buckingham Palace to honour the children of those who have died serving in the armed forces on May 13, 2017 in London, England. (Photo by Andrew Parsons - WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - MAY 13: Catherine, Duchess of Cambridge meets guests at a tea party in the grounds of Buckingham Palace to honour the children of those who have died serving in the armed forces on May 13, 2017 in London, England. (Photo by Andrew Parsons - WPA Pool/Getty Images)