- Met (now ex-) husband Val Kilmer while filming Willow (1988).
- Did not tell her husband, Val Kilmer, that she wanted a divorce. She waited until after he left to work on The Island of Dr. Moreau (1996) to file the divorce papers. He heard the news while watching CNN in a hotel room. He said finding out about it, especially like that, hurt him greatly.
- Best known to most audiences as Sorsha in Willow (1988). She had her dark brown hair dyed bright red for the role.
- Gave birth, at age 33, to her 2nd child, son Jack Kilmer, on June 6, 1995. Child's father is her now ex-husband, Val Kilmer.
- Gave birth to her 1st child at age 30, a daughter Mercedes Kilmer on October 29, 1991. Child's father is her now ex-husband, Val Kilmer.
- Chosen by People magazine as one of the 50 Most Beautiful People in the world. (1991)
- She played Queen Mary I of England in The Virgin Queen (2005) and her mother Catherine of Aragon in Wolf Hall (2015).
- Featured on Blink-182's 2003 self-titled album on the track Stockholm Syndrome Interlude.
- Performed the role of the unnamed narrator in the audiobook of Elizabeth Kostova's "The Historian".
- Was a member of the group Cindy & The Saffrons (Joanne was Cindy, The Saffrons were Lindsay Neil and Sally Stairs). They recorded the Shangri-Las song "Past, Present and Future" (1982) and "Terry" by Twinkle (1983).
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