(From L-R) Britain's Princess Anne, Princess Royal, Britain's Queen Elizabeth II, Britain's Prince Philip, Duke of Edinburgh and Britain's Prince Harry arrive to attend a Garden Party for members of the Household Cavalry at  Buckingham Palace in central London on May 28, 2015. AFP PHOTO/POOL/JOHN STILLWELL / AFP PHOTO / POOL / JOHN STILLWELL        (Photo credit should read JOHN STILLWELL/AFP/Getty Images)