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Princess Elizabeth (later Queen Elizabeth II) with her baby son Prince Charles, 1949. (Photo by Fox Photos/Hulton Archive/Getty Images)

Princess Elizabeth (later Queen Elizabeth II) with her baby son Prince Charles, 1949. (Photo by Fox Photos/Hulton Archive/Getty Images)

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28th September 1952: Queen Elizabeth II leaning out of a window with Princess Anne Elizabeth Alice Louise (left) and Prince Charles Philip Arthur George. (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

28th September 1952:  Queen Elizabeth II leaning out of a window with Princess Anne Elizabeth Alice Louise (left)  and Prince Charles Philip Arthur George.  (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

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Queen Elizabeth, Prince Philip, Prince Andrew and Prince Edward waving to the crowds from the balcony at Buckingham Palace, during the Trooping of the Colour. (Photo by Fox Photos/Getty Images)

Queen Elizabeth, Prince Philip, Prince Andrew and Prince Edward waving to the crowds from the balcony at Buckingham Palace, during the Trooping of the Colour.    (Photo by Fox Photos/Getty Images)

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WINDSOR, ROYAUME-UNI - 1969: Photographie issue d'un reportage intitule 'Le Prince en toute simplicite', le Prince Charles apprend a son petit frere, le Prince Edward, age de 5 ans, a faire du kart sous le regard de la Reine Elizabeth au Chateau de Windsor, en 1969 a Windsor, Royaume-Uni. (Photo by Keystone-France\Gamma-Rapho via Getty Images)

WINDSOR, ROYAUME-UNI - 1969: Photographie issue d'un reportage intitule 'Le Prince en toute simplicite', le Prince Charles apprend a son petit frere, le Prince Edward, age de 5 ans, a faire du kart sous le regard de la Reine Elizabeth au Chateau de Windsor, en 1969 a Windsor, Royaume-Uni.  (Photo by Keystone-France\Gamma-Rapho via Getty Images)

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The royal family at Buckingham Palace, London, 1972. Left to right: Princess Anne, Prince Andrew, Prince Philip, Queen Elizabeth, Prince Edward and Prince Charles. (Photo by Fox Photos/Hulton Archive/Getty Images)Elizabeth II

The royal family at Buckingham Palace, London, 1972. Left to right: Princess Anne, Prince Andrew, Prince Philip, Queen Elizabeth, Prince Edward and Prince Charles. (Photo by Fox Photos/Hulton Archive/Getty Images)Elizabeth II