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)