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28th September 1952: Princess Anne at Balmoral Castle on the arm of a seat. (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

28th September 1952:  Princess Anne at Balmoral Castle on the arm of a seat.  (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

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LONDON, UNITED KINGDOM - JANUARY 1: An undated picture shows Britain's Princess Anne laughing while she is posing with her brother Prince Charles. (Photo credit should read STF/AFP via Getty Images)

LONDON, UNITED KINGDOM - JANUARY 1:  An undated picture shows Britain's Princess Anne laughing while she is posing with her brother Prince Charles.  (Photo credit should read STF/AFP via Getty Images)

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Volume 1: Page 29, Picture 5, British Royalty, 5th August 1953, Prince Charles and Princess Anne as young children, (Photo by Popperfoto via Getty Images/Getty Images)

Volume 1: Page 29, Picture 5, British Royalty, 5th August 1953, Prince Charles and Princess Anne as young children,  (Photo by Popperfoto via Getty Images/Getty Images)

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MALTA - JANUARY 01: Princess ANNE and her brother, Prince CHARLES hand in hand. This was in 1954 when the children were taken out to Malta to meet their parents who arrived on the Royal Yacht after a long tour of the Commonwealth. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

MALTA - JANUARY 01:  Princess ANNE and her brother, Prince CHARLES hand in hand. This was in 1954 when the children were taken out to Malta to meet their parents who arrived on the Royal Yacht after a long tour of the Commonwealth.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)

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7th April 1954: Princess Anne Elizabeth Alice Louise looking out of an open window at Windsor Castle, Berkshire. (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

7th April 1954:  Princess Anne Elizabeth Alice Louise looking out of an open window at Windsor Castle, Berkshire.  (Photo by Lisa Sheridan/Studio Lisa/Getty Images)