- Named after, and is the goddaughter of, Joan Crawford.
- The daughter of writers Dale Eunson and Katherine Albert.
- Her parents asked Crawford, their daughter's godmother, to dissuade her from marrying, since she was so young, but Crawford (reportedly bearing a grudge against Evans' parents over a perceived offense) not only gave the couple her blessing, but she made the arrangements and had the wedding ceremony performed right in her own house without notifying Evans' parents. Evans's marriage to Weatherly lasted, but the friendship between Evans' parents and Crawford ended permanently.
- Has a son John and a daughter Dale.
- Was accidentally shot on set by Farley Granger while making her first movie "Roseanna McCoy".
- Was an editor of Hollywood Studio Magazine.
- Was a teacher at the Carden Academy in Van Nuys, California.
- Her first film with him was as the title role in Roseanna McCoy (1949), based on the real-life romance between two members of the Hatfield-McCoy feud. She gained the role after producer Samuel Goldwyn conducted a national talent search after the original star, Cathy O'Donnell, pulled out. Evans was only 14 years old when she started work on Roseanna McCoy, and her parents added two years to her age so she could claim to be 16 when the film was released.
- She played Gretel in a school performance of Hansel and Gretel.
- In the 1950s, Evans wrote articles for Photoplay magazine.
- Her father wrote the book The Day They Gave Babies Away, which was made into the movie All Mine to Give (1957).
- For director Sam Katzman, she was one of The Flying Fontaines (1959).
- MGM lent her to Universal, where she was third-billed as Irene Dunne's daughter in It Grows on Trees (1952).
- Beginning in May 1966, she was editor of Hollywood Studio Magazine, using her married name, Joan Evans Weatherly.
- Evans had top billing as a suicidal teenager in RKO's drama On the Loose (1951), then second billing to Esther Williams in an musical comedy, Skirts Ahoy! (1952).
- She retired from acting at just 27 years old.
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