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British Royalty, London, England, 6th May 1960, H,R,H, Princess Margaret with her Anthony Armstrong-Jones wave to the crowd from the balcony of Buckingham Palace after they had been married in Westminster Abbey (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

British Royalty, London, England, 6th May 1960, H,R,H, Princess Margaret with her Anthony Armstrong-Jones wave to the crowd from the balcony of Buckingham Palace after they had been married in Westminster Abbey  (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

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British Royalty, London, England, 6th May 1960, H,R,H,Princess Margaret leaves Westminster Abbey, accompanied by her husband Anthony Armstrong-Jones after their wedding (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

British Royalty, London, England, 6th May 1960, H,R,H,Princess Margaret leaves Westminster Abbey, accompanied by her husband Anthony Armstrong-Jones after their wedding  (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

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6th May 1960: Princess Margaret (1930 - 2002) and her husband Antony Armstrong-Jones walking down the aisle at Westminster Abbey after their marriage ceremony. (Photo by Fox Photos/Getty Images)

6th May 1960:  Princess Margaret (1930 - 2002) and her husband Antony Armstrong-Jones walking down the aisle at Westminster Abbey after their marriage ceremony.  (Photo by Fox Photos/Getty Images)

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27th, October, 1960, Princess Margaret followed by husband Anthony Armstrong-Jones, arrive for the London West End theatre premiere of the John Wayne film "The Alamo" (Photo by Popperfoto via Getty Images/Getty Images)

27th, October, 1960, Princess Margaret followed by husband Anthony Armstrong-Jones, arrive for the London West End theatre premiere of the John Wayne film "The Alamo"  (Photo by Popperfoto via Getty Images/Getty Images)

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6th May 1960: Earl Snowdon and Princess Margaret (1930 - 2002) (centre) on the balcony at Buckingham Palace with members of the immediate and extended British Monarchy after their wedding. (Photo by Edward Miller/Keystone/Getty Images)

6th May 1960:  Earl Snowdon and Princess Margaret (1930 - 2002) (centre) on the balcony at Buckingham Palace with members of the immediate and extended British Monarchy after their wedding.  (Photo by Edward Miller/Keystone/Getty Images)