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YORK, UNITED KINGDOM - JUNE 08: Bridesmaid Princess Anne enters her car after the wedding of Duke of Kent with Katharine Worsley at York Minster on June 8, 1961 in York, United Kingdom. (Photo by Keystone-France/Gamma-Rapho via Getty Images)

YORK, UNITED KINGDOM - JUNE 08: Bridesmaid Princess Anne enters her car after the wedding of Duke of Kent with Katharine Worsley at York Minster on June 8, 1961 in York, United Kingdom. (Photo by Keystone-France/Gamma-Rapho via Getty Images)

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LONDON, UNITED KINGDOM - MAY 06: Official picture of the wedding Of Princess Margaret With Antony Armstrong Jones surrounded by Princess Ann on right, Best Man Roger Gilliat, standing on right on May 6, 1960 in London, United Kingdom. (Photo by Keystone-France/Gamma-Rapho via Getty Images)

LONDON, UNITED KINGDOM - MAY 06: Official picture of the wedding Of Princess Margaret With Antony Armstrong Jones surrounded by Princess Ann on right, Best Man Roger Gilliat, standing on right on May 6, 1960 in London, United Kingdom. (Photo by Keystone-France/Gamma-Rapho via Getty Images)

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UNITED KINGDOM - MAY 06: On Balcony Of Buckingham Palace With The Bridesmaids, The Princess Anne (On Extreme Left) And The Queen Mother Behind Them. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

UNITED KINGDOM - MAY 06:  On Balcony Of Buckingham Palace With The Bridesmaids, The Princess Anne (On Extreme Left) And The Queen Mother Behind Them.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)

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Princess Anne carrying a confetti basket leads the other bridesmaids at the wedding of her aunt Princess Margaret . On the left is Prince Charles with the Queen's uncle Sir David Bowes Lyon (brother of the Queen Mother). The Queen Mother is behind Princess Anne and on the right of the Queen Mother is the Duchess of Gloucester. (Photo by Victor Blackman/Getty Images)

Princess Anne carrying a confetti basket leads the other bridesmaids at the wedding of her aunt Princess Margaret . On the left is Prince Charles with the Queen's uncle Sir David Bowes Lyon (brother of the Queen Mother). The Queen Mother is behind Princess Anne and on the right of the Queen Mother is the Duchess of Gloucester.   (Photo by Victor Blackman/Getty Images)

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CROSFIELD HALL, ROYAUME-UNI - 14 JANVIER : La Princesse Anne, demoiselle d'honneur au mariage de Lady Pamela Mountbatten et David Hicks, jette un oeil aux cadeaux de mariage en compagnie de Lord Brabourne le 14 janvier 1960 a Crosfield Hall, Royaume-Uni. (Photo by Keystone-France\Gamma-Rapho via Getty Images)

CROSFIELD HALL, ROYAUME-UNI - 14 JANVIER : La Princesse Anne, demoiselle d'honneur au mariage de Lady Pamela Mountbatten et David Hicks, jette un oeil aux cadeaux de mariage en compagnie de Lord Brabourne le 14 janvier 1960 a Crosfield Hall, Royaume-Uni.  (Photo by Keystone-France\Gamma-Rapho via Getty Images)