Tatum O'Neal, in full Tatum Beatrice O'Neal.

Tatum O'Neal, in full Tatum Beatrice O'Neal, (born November 5, 1963, Los Angeles, California, U.S.), American actress who, at 10 years old, turned into the youngest person to win an Academy Award in competition when she got the Oscar for best supporting actress for her performance as Addie Loggins in Paper Moon (1973). 

O'Neal was the little girl of actors Ryan O'Neal and Joanna Moore. When she was eight years of age, director Peter Bogdanovich approached her father and her with a proposal for them to costar in a movie dependent on the novel Addie Pray (1971) by Joe David Brown, although Tatum had at no other time acted. Her grave performance as an astute cigarette-smoking nine-year-old who teams up with a bogus Bible sales rep (who might be her father) to form a noteworthy con team in the Depression-set film won her basic acclaim and a Golden Globe Award for most promising new actress just as the Oscar. In her next film, O'Neal played the pitching expert on an oddball youth baseball team in the popular comedy The Bad News Bears (1976). She also portrayed an ambitious prop young lady in Bogdanovich's less effective film Nickelodeon (1976), which included her father and Burt Reynolds. O'Neal then featured with Christopher Plummer and Anthony Hopkins in International Velvet (1978), a spin-off of National Velvet (1944).

O'Neal's ensuing movies included Little Darlings (1980), in which she costarred with Kristy McNichol; the biopic Basquiat (1996); and The Scoundrel's Wife (2002). O'Neal was during a significant part of the time from the mid-1980s better known for her troubled union with tennis star John McEnroe and for her battles with illicit drug use than for her work as an actress. She later featured in the 2006–07 television arrangement Wicked Games, showed up in the music biopic The Runaways (2010), and played the lead character's troubled sister in a common role in the TV show Rescue Me (2004–11).