Queen Elizabeth II talks with Louis Mountbatten, 1st Earl Mountbatten of Burma (1900-1979) as they attend the premiere of the film 'Dunkirk' at the Empire Cinema in Leicester Square, London on March 20th 1958. (Photo by Paul Popper/Popperfoto/Getty Images)

Queen Elizabeth II talks with Louis Mountbatten, 1st Earl Mountbatten of Burma (1900-1979) as they attend the premiere of the film 'Dunkirk' at the Empire Cinema in Leicester Square, London on March 20th 1958. (Photo by Paul Popper/Popperfoto/Getty Images)