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A portrait of the British royal family in the state apartments at Buckingham Palace to mark the engagement of Princess Elizabeth (later Queen Elizabeth II) and Philip Mountbatten (later Duke of Edinburgh), July 1947. Left to right: Princess Elizabeth, Philip Mountbatten, Queen Elizabeth the Queen Mother (1900 - 2002), King George VI (1895 - 1952) and Princess Margaret (1930 - 2002). (Photo by Popperfoto via Getty Images/Getty Images)

A portrait of the British royal family in the state apartments at Buckingham Palace to mark the engagement of Princess Elizabeth (later Queen Elizabeth II) and Philip Mountbatten (later Duke of Edinburgh), July 1947. Left to right: Princess Elizabeth, Philip Mountbatten, Queen Elizabeth the Queen Mother (1900 - 2002), King George VI (1895 - 1952) and Princess Margaret (1930 - 2002). (Photo by Popperfoto via Getty Images/Getty Images)

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20th November 1947: Princess Elizabeth, and The Prince Philip, Duke of Edinburgh at Buckingham Palace after their wedding. (Photo by Hulton Archive/Getty Images)

20th November 1947:  Princess Elizabeth, and The Prince Philip, Duke of Edinburgh at Buckingham Palace after their wedding.  (Photo by Hulton Archive/Getty Images)

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Princess Elizabeth and the Duke of Edinburgh playing with the Princess's pet corgi Susan at Broadlands in Hampshire, during the start of their honeymoon, 24th November 1947. (Photo by Topical Press Agency/Hulton Archive/Getty Images)

Princess Elizabeth and the Duke of Edinburgh playing with the Princess's pet corgi Susan at Broadlands in Hampshire, during the start of their honeymoon, 24th November 1947.  (Photo by Topical Press Agency/Hulton Archive/Getty Images)

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August 1951: Princess Elizabeth with her husband Prince Philip Duke of Edinburgh and their children Prince Charles and Princess Anne. (Photo by Keystone/Getty Images)

August 1951:  Princess Elizabeth with her husband Prince Philip Duke of Edinburgh and their children Prince Charles and Princess Anne.  (Photo by Keystone/Getty Images)

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Princess Elizabeth and her husband Prince Philip, Duke of Edinburgh during their honeymoon in Malta, where he is stationed with the Royal Navy, 1947. (Photo by Hulton Archive/Getty Images)

Princess Elizabeth and her husband Prince Philip, Duke of Edinburgh during their honeymoon in Malta, where he is stationed with the Royal Navy, 1947. (Photo by Hulton Archive/Getty Images)