- One of "The Mitford Girls". Sister of: Nancy Mitford, Pamela Mitford (1907-1994), Tom Mitford, Unity Mitford (friend of Adolf Hitler), Jessica Mitford, and Deborah Cavendish.
- Second cousin of Rupert Mitford, and Clementine Churchill.
- Evelyn Waugh dedicated his novel, Vile Bodies, to Diana and husband at the time, Bryan Guinness.
- Mother of Jonathan Guinness 3rd Baron Moyne, Hon. Desmond Guinness, Max Mosley and Alexander Mosley.
- Created one of the biggest social scandals of 1932 when she left her husband, Bryan Guinness, to become Sir Oswald Mosley's mistress.
- Married Sir Oswald Mosley in 1936 in Magda Goebbels and Joseph Goebbels' drawing room. Adolf Hitler, a good friend of Diana's, was their witness.
- Attended Nazi Party rallies with her sister Unity Mitford. Unity was a member of Hitler's inner circle.
- In the 1930s, Diana was considered to be the most beautiful woman in London.
- Eldest sister, Nancy Mitford, told the Home Office that Diana was a danger to the government and in turn was interned without charge at Holloway prison for five years- 1939-1944. Diana never learned of her sister's actions until after Nancy's death in 1973.
- Was good friends with Hubert de Givenchy.
- Sister Jessica refused to speak to Diana after her marriage to Sir Oswald Mosley. This feud carried on until Jessica's death 1996.
- Grandmother of socialite and fashion muse, Daphne Guinness.
- Grandmother of Valentine Guinness, who married fashion designer Lulu Guinness.
- Great-grandmother of fashion model and designer, Jasmine Guinness.
- Was photographed with four generations of her family, son Desmond Guinness, grandson Patrick Guinness, great-granddaughter Jasmine Guinness and great-great-grandson Elwood Rainey shortly before she died.
- Her autobiography, A Life of Contrasts, was a bestseller.
- She was the last person alive who had known both Winston Churchill and Adolf Hitler personally.
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