LONDON, ENGLAND - DECEMBER 19: (L-R) Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge stand ready to give an award during a visit to a Christmas party for volunteers at The Mix youth service on December 19, 2016 in London, England. The Mix youth service works with Their Royal Highnesses' Heads Together Campaign. (Photo by Alastair Grant - WPA Pool/Getty Images)
