CHICAGO Former child star Mackenzie Phillips told The Oprah Winfrey Show in an interview that aired Wednesday that her father, John Phillips, who was a leader of the 1960s pop group the Mamas and the Papas, raped her when she was a teenager and that her sexual relationship with him later became what she termed consensual.

Mackenzie Phillips writes in her new book, High on Arrival, that she had sex with her father on the night before she was to get married in 1979 at age 19, according to People magazine.

Phillips wrote in her book: I woke up that night from a blackout to find myself having sex with my own father.

Winfrey read a statement from Genevieve Waite, John Phillips wife at the time of the alleged abuse and Mackenzies stepmother, that said he was incapable, no matter how drunk or drugged he was, of having such a relationship with his own child.

Phillips, who starred on TVs One Day at a Time, said the sexual relationship with her father lasted a decade and ended when she became pregnant and didnt know who had fathered the child. She had an abortion, which her father paid for, and and I never let him touch me again.

Phillips told Winfrey that she first tried cocaine when she was 11 years old. Her father did drugs with her, taught her to roll joints and injected her with cocaine. Phillips said shes been clean for a year after pleading guilty to possessing cocaine and entering a drug treatment program.