Mackenzie Phillips says she had sex with her dad (AP)

Mackenzie Phillips, 49, 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.

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Phillips wrote in her book: "I woke up that night from a blackout to find myself having sex with my own father." John Phillips, who died in 2001, was the leader of the 1960s group the Mamas and the Papas . . Phillips has long acknowledged having drug problems, and she 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 she's been clean for a year after pleading guilty to possessing cocaine and entering a drug treatment program.

Full Story: Mackenzie Phillips says she had sex with her dad (AP)