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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/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/Getty Images)

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Princess Elizabeth (later Queen Elizabeth II) and her fiance, Philip Mountbatten at Buckingham Palace, after their engagement was announced, 10th July 1947. (Photo by Topical Press Agency/Hulton Archive/Getty Images)

Princess Elizabeth (later Queen Elizabeth II) and her fiance, Philip Mountbatten at Buckingham Palace, after their engagement was announced, 10th July 1947. (Photo by Topical Press Agency/Hulton Archive/Getty Images)

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Princess Elizabeth and Lieutenant Philip Mountbatten pose at Buckingham Palace after announcing their engagement, London, 10th July 1947. (Photo by Paul Popper/Popperfoto/Getty Images)

Princess Elizabeth and Lieutenant Philip Mountbatten pose at Buckingham Palace after announcing their engagement, London, 10th July 1947. (Photo by Paul Popper/Popperfoto/Getty Images)

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LONDRES, ROYAUME-UNI - 10 JUILLET: La Princesse Elizabeth porte sa bague de fiancaille lors de l'annonce officielle de ses fiancailles avec Philip Mountbatten le 10 juillet 1947 a Londres, Royaume-Uni. (Photo by Keystone-France\Gamma-Rapho via Getty Images)

LONDRES, ROYAUME-UNI - 10 JUILLET: La Princesse Elizabeth porte sa bague de fiancaille lors de l'annonce officielle de ses fiancailles avec Philip Mountbatten le 10 juillet 1947 a Londres, Royaume-Uni.  (Photo by Keystone-France\Gamma-Rapho via Getty Images)

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Princess Elizabeth (later Queen Elizabeth II) and her betrothed, Lieutenant Philip Mountbatten (later Duke of Edinburgh) pose together with Princess Margaret (1930-2002) at Buckingham Palace in London after announcing their engagement on 10th July 1947. (Photo by Rolls Press/Popperfoto/Getty Images)

Princess Elizabeth (later Queen Elizabeth II) and her betrothed, Lieutenant Philip Mountbatten (later Duke of Edinburgh) pose together with Princess Margaret (1930-2002) at Buckingham Palace in London after announcing their engagement on 10th July 1947. (Photo by Rolls Press/Popperfoto/Getty Images)