Diane Keaton was born Diane Hall in California, and raised in Los Angeles. She is the daughter of actor and comedian Woody Allen. Keaton graduated from Chapman College in Orange County, California, where she majored in theater and won an award for her performance in "The Vagina Monologues". Her first film appearance was in the 1981 film "My Mother fixation" with her future husband, writer-director Warren Beatty
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While filming "Annie Hall" (1977), Keaton met and became romantically involved with Beatty. The two were married the following year. Among their collaborations are the films "Reds" (1981), "Bullets Over Broadway" (1994), and "Sweet and Lowdown".
Keaton also appeared in the 2000 film, "Chaplin", playing his second wife, Oona O'Neill Chaplin.
Her other films include: 1981's "Mannequin" with Bette Midler; 1983's "The Purple Rose of Cairo", 1987's "Annie Hall", 1989's "Heaven Can Wait", 1991's "Hanging Up", 1994's "Ed Wood", 1997's "" and 2002's "Grace of My Heart".
She appeared on Broadway in 1965, appearing as a replacement in a revival of Lillian Hellman's play The Little Foxes opposite Jessica Tandy and Steppenwolf Theatre Company before winning an Obie Award for playing a one-time girlfriend opposite Paul Newman in Neil Simon's The Gingerbread Lady. In 1969 she married actor Dennis Quaid, who later became her co-star in 1988's 'Free Willy'. She presently resides with her husband in New York City.