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31st July 1950: Princess Margaret Rose (1930 - 2002), as a bridesmaid at the wedding of Margaret Elphinstone, a niece of the Queen's, and Denys Rhodes at St Margaret's, Westminster, London. (Photo by Topical Press Agency/Getty Images)

31st July 1950:  Princess Margaret Rose (1930 - 2002), as a bridesmaid at the wedding of Margaret Elphinstone, a niece of the Queen's, and Denys Rhodes at St Margaret's, Westminster, London.  (Photo by Topical Press Agency/Getty Images)

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1946: From left to right, Pamela Mountbatten, Princess Alexandra of Kent, Princess Margaret (1930 - 2002) and Princess Elizabeth stand outside Romsey Abbey, Hampshire in their bridesmaids' dresses after attending the wedding of Captain Lord Brabourne and Patricia Mountbatten. (Photo by PNA Rota/Getty Images)

1946:  From left to right, Pamela Mountbatten, Princess Alexandra of Kent, Princess Margaret (1930 - 2002) and Princess Elizabeth stand outside Romsey Abbey, Hampshire in their bridesmaids' dresses after attending the wedding of Captain Lord Brabourne and Patricia Mountbatten.  (Photo by PNA Rota/Getty Images)

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Princess Elizabeth and Philip, Duke of Edinburgh, pose with King George VI and Queen Elizabeth and other members of the royal family at Buckingham Palace, after their wedding, 20th November 1947. The two pageboys are Elizabeth's cousins, Prince William of Gloucester and Prince Michael of Kent, and the eight bridesmaids are Princess Margaret, Princess Alexandra of Kent, Lady Caroline Montagu-Douglas-Scott, Lady Mary Cambridge, Lady Elizabeth Lambart, Pamela Mountbatten, Margaret Elphinstone and Diana Bowes-Lyon. Queen Mary and Princess Andrew of Greece are at left front. (Photo by Bentley Archive/Popperfoto via Getty Images/Getty Images)

Princess Elizabeth and Philip, Duke of Edinburgh, pose with King George VI and Queen Elizabeth and other members of the royal family at Buckingham Palace, after their wedding, 20th November 1947. The two pageboys are Elizabeth's cousins, Prince William of Gloucester and Prince Michael of Kent, and the eight bridesmaids are Princess Margaret, Princess Alexandra of Kent, Lady Caroline Montagu-Douglas-Scott, Lady Mary Cambridge, Lady Elizabeth Lambart, Pamela Mountbatten, Margaret Elphinstone and Diana Bowes-Lyon. Queen Mary and Princess Andrew of Greece are at left front. (Photo by Bentley Archive/Popperfoto via Getty Images/Getty Images)

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20th November 1947: The royal group on the balcony of Buckingham Palace after returning from the wedding ceremony between Princess Elizabeth and the Duke of Edinburgh at Westminster Abbey. (left to right) Princess Margaret (1930 - 2002), Margaret Elphinstone, Diana Bowes-Lyon, Lady Caroline Montague Douglas-Scott, Lady Elizabeth Lambert, the Marquis of Milford-Haven, Prince William, the bride and groom, Lady Mary Cambridge and Lady Pamela Mountbatten. (Photo by Topical Press Agency/Getty Images)

20th November 1947:  The royal group on the balcony of Buckingham Palace after returning from the wedding ceremony between Princess Elizabeth and the Duke of Edinburgh at Westminster Abbey. (left to right) Princess Margaret (1930 - 2002), Margaret Elphinstone, Diana Bowes-Lyon, Lady Caroline Montague Douglas-Scott, Lady Elizabeth Lambert, the Marquis of Milford-Haven, Prince William, the bride and groom, Lady Mary Cambridge and Lady Pamela Mountbatten.  (Photo by Topical Press Agency/Getty Images)

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21st October 1948: Princess Margaret (1930 - 2002) with the bridesmaids at the wedding of Lady Egerton. (Photo by Allan/Express/Getty Images)

21st October 1948:  Princess Margaret (1930 - 2002) with the bridesmaids at the wedding of Lady Egerton.  (Photo by Allan/Express/Getty Images)