- A former Ford model, for 30 years she was the face and spokeswoman for Cover Girl cosmetics, and is catalogued in the Smithsonian Institute's American History Museum, Center for Commercial Advertising.
- Married nine times to eight different men (she married husband #6 twice). Her ninth marriage, to Mervin Sidney Louque, has lasted longer than her other eight marriages combined.
- Became an overnight film star and made an immediate "older woman" impact on young boys everywhere in the coming-of-age film Summer of '42 (1971), despite the fact that she was only in the movie for 12 minutes.
- Her father was Oscar O'Neill (1919-2009), a WWII bomber pilot who flew B-17s and once had his plane shot down over Germany where he survived a prison camp. After the war he went back to England to marry Irene ("Rene").
- Broke her back and neck as a youth when a horse she was riding fell on her.
- Accidentally shot herself in the abdomen on October 22, 1982 at her home in Bedford Hills, New York.
- As of 2013 she was a motivational speaker to groups of Christian women and church groups. She and her husband live in the heart of Nashville, Tennessee, where her two sons also reside. She has a horse ranch called Hillenglade in Goodlettsville, Tennessee, which she operates as a retreat for young girls and military families.
- Was sought for the role of Kay Adams in The Godfather (1972) before Diane Keaton was hired.
- Was engaged to Elliott Gould in 1974.
- Her grandfather, Oscar O'Neill Sr., was President of the Bank of Rio de Janeiro, Brazil. Her father, Oscar O'Neill Jr., was a medical supplies exporter. Her English-born mother Irene met Oscar O'Neill Jr. when he was stationed in London during WWII; they married c. 1945.
- Lives on a horse farm in Nashville, Tennessee.
- Was considered for the role of Elvira Hancock in Scarface (1983) but Michelle Pfeiffer was cast instead.
- She has said that as a young girl she married a US Marine, who allegedly fought in Vietnam and returned with undiagnosed and untreated PTSD, contributing to their divorce.
- Named after Jennifer Jones after her parents saw a poster of Jones at a local cinema that was playing Duel in the Sun (1946).
- She has a daughter named Aimee Rossiter (b. 4/26/67) and two sons: Reis Michael Lederer (b. 1981) and Cooper Alan (b. 3/8/87). She has four grandchildren.
- Enjoys horseback riding and training, cooking, music, singing, painting, designing furniture.
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