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Princess Elizabeth poses in her girl guide uniform in Frogmore, Windsor, England on April 11, 1942. (Photo by Studio Lisa/Getty Images)

Princess Elizabeth poses in her girl guide uniform in Frogmore, Windsor, England on April 11, 1942.  (Photo by Studio Lisa/Getty Images)

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Princess Elizabeth (now Queen Elizabeth II) driving an ambulance during her wartime service in the A.T.S. (Auxiliary Territorial Service), 10th April 1945. (Photo by Popperfoto/Getty Images)

Princess Elizabeth (now Queen Elizabeth II) driving an ambulance during her wartime service in the  A.T.S. (Auxiliary Territorial Service), 10th April 1945. (Photo by Popperfoto/Getty Images)

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British Royalty, pic: 20th November 1947, Buckingham Palace, London, The wedding of Princess Elizabeth and the Duke of Edinburgh showing the Princess looking radiant after the wedding at Westminster Abbey (Photo by Popperfoto via Getty Images/Getty Images)

British Royalty, pic: 20th November 1947, Buckingham Palace, London, The wedding of Princess Elizabeth and the Duke of Edinburgh showing the Princess looking radiant after the wedding at Westminster Abbey  (Photo by Popperfoto via Getty Images/Getty Images)

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Queen Elizabeth II on the balcony of Buckingham Palace after her Coronation ceremony with (left to right); Prince Charles, Princess Anne and The Prince Philip, Duke of Edinburgh. (Photo by Fox Photos/Getty Images)

Queen Elizabeth II on the balcony of Buckingham Palace after her Coronation ceremony with (left to right); Prince Charles, Princess Anne and The Prince Philip, Duke of Edinburgh.   (Photo by Fox Photos/Getty Images)