NEW YORK, NY - CIRCA 1974: Princess Margaret and Antony Armstrong-Jones attend the Royal Ballet at the MET circa May 1974 in New York City. (Photo by PL Gould/Images/Getty Images)

Princess Margaret attends Military Display at Up-Park Camp, Jamaica, at which Her Royal Highness inspected the Jamaica Regiment and took the Salute at the Trooping of the Colour, Monday 12th February 1955. (Photo by Freddie Reed/Mirrorpix/Getty Images)

Princess Margaret, Countess of Snowdon (1930 - 2002) at Great Windsor Park to attend a polo tournament, UK, 1955. (Photo by Slim Aarons/Getty Images)

BADMINTON, ENGLAND - APRIL 18: Princess Margaret with her husband, born Antony Armstrong-Jones, photographer Lord Snowdon attend Badminton Horse Trials on April 18, 1970 in Badminton, England. (Photo by Anwar Hussein/WireImage)

NASSAU, BAHAMAS - MARCH 14: Princess Margaret, the younger sister of Britain's Queen Elizabeth II, walks 14 March 1967 with her husband Earl of Snowdon on a pontoon in the Bahamas. Princess Margaret and the Earl of Snowdon had two children, son Linley and daughter Sarah, but announced their separation in March 1976. When the marriage was officially ended two years later, Margaret became the first royal to divorce since Henry VIII in the 16th century. (Photo credit should read DALMAS/AFP/Getty Images)

1960: Princess Margaret (1930 - 2002) arrives at the Strowger Works in Edge Lane, Liverpool. (Photo by Hulton Archive/Getty Images)

ASCOT, UNITED KINGDOM - APRIL 17: Princess Margaret At A Pony Day At Ascot (Photo by Tim Graham Photo Library via Getty Images)

Princess Margaret, Countess of Snowdon (1930 - 2002) arrives in England after her tour of Canada, 12th August 1958. (Photo by Victor Blackman/Daily Express/Hulton Archive/Getty Images)

LONDON, UNITED KINGDOM - OCTOBER 08: Princess Margaret With Lord Snowdon And Their Daughter Lady Sarah Armstrong-jones Attending The Wedding Of Their Son Lord Linley (Photo by Tim Graham Photo Library via Getty Images)