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Venice, Italy, 14th October 1971, Photographer Lord Snowdon, husband of Princess Margaret, pictured at work in Venice (Photo by Popperfoto via Getty Images/Getty Images)

Venice, Italy, 14th October 1971, Photographer Lord Snowdon, husband of Princess Margaret, pictured at work in Venice  (Photo by Popperfoto via Getty Images/Getty Images)

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Princess Margaret Rose, (1930 - 2002), Countess of Snowdon, with her husband Lord Snowdon, Anthony Armstrong Jones, and their children David (Lord Linley) and Sarah Armstrong Jones, 1974. (Photo by Terry O'Neill/Iconic Images/Getty Images)

Princess Margaret Rose, (1930 - 2002), Countess of Snowdon, with her husband Lord Snowdon, Anthony Armstrong Jones, and their children David (Lord Linley) and Sarah Armstrong Jones, 1974. (Photo by Terry O'Neill/Iconic Images/Getty Images)

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Princess Margaret and her new husband Antony Armstrong-Jones leave Westminister Abbey after their wedding.

Princess Margaret and her new husband Antony Armstrong-Jones leave Westminister Abbey after their wedding.

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June 1973: Princess Margaret (1930 - 2002) and her husband Antony Armstrong-Jones, the Earl of Snowdon, attend the Trooping the Colour ceremony at Buckingham Palace, London. (Photo by Central Press/Getty Images)

June 1973:  Princess Margaret (1930 - 2002) and her husband Antony Armstrong-Jones, the Earl of Snowdon, attend the Trooping the Colour ceremony at Buckingham Palace, London.  (Photo by Central Press/Getty Images)

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Antony Armstrong-Jones Antique opens the Antique Dealers' Fair at Grosvenor House, London, 7th June 1961. He is filling in for his wife, Princess Margaret. (Photo by Jimmy Sime/Central Press/Getty Images)

Antony Armstrong-Jones Antique opens the Antique Dealers' Fair at Grosvenor House, London, 7th June 1961. He is filling in for his wife, Princess Margaret. (Photo by Jimmy Sime/Central Press/Getty Images)