Tatum Beatrice O'Neal (born November 5, 1963) is an American actress best known for her film work as a child actress in the 1970s. She is the youngest person ever to win a competitive Academy Award, at the age of 10, which she won for her performance as Addie Loggins in Paper Moon (1973) opposite her father Ryan O'Neal. She then starred in The Bad News Bears in 1976, followed by Nickelodeon (1976), International Velvet (1978) and Little Darlings (1980).
In 1986, she married professional tennis player John McEnroe, with whom she had three children. The couple separated in 1992 and were divorced in 1994.
O'Neal was born in Los Angeles, California, the daughter of actors Ryan O'Neal and Joanna Moore, who had appeared in various motion pictures and television shows. Her brother, Griffin, was born in 1964. In 1967, her parents divorced and her father quickly remarried. Her father's marriage to actress Leigh Taylor-Young produced Tatum's half-brother, Patrick, but the union ended in divorce in 1973. Tatum has another half-brother, Redmond, from Ryan O'Neal's relationship with actress Farrah Fawcett. O'Neal's mother died in 1997 of lung cancer at age 63, after a career in which she had appeared in such movies as Walk on the Wild Side and Follow That Dream.
In 1974, Tatum O'Neal became the youngest person ever to win a competitive Academy Award. She won the Academy Award for Best Supporting Actress and the Golden Globe Award for New Star Of The Year - Actress for her performance in Paper Moon. O'Neal played the role of Addie Loggins, a child con artist being tutored by a Depression-era grifter played by her father, Ryan. She was 10 years old at the time she won the award.
During her childhood and teenage years, O'Neal dated Michael Jackson in 1977, but after a half year relationship, the two separated. O'Neal also starred in notable films such as The Bad News Bears (1976) with Walter Matthau, International Velvet (1978) with Christopher Plummer and Anthony Hopkins, and Little Darlings (1980) with Kristy McNichol. She also appeared in the less-successful film Nickelodeon (1976) with her father Ryan, and in Circle of Two (1980) with Richard Burton. She appeared as the title character in the Faerie Tale Theatre episode Goldilocks and the Three Bears (1984).