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NEW YORK -- Mackenzie Phillips reveals she had a sexual relationship with her father, John Phillips, a member of the '60s Mamas and the Papas band.

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People magazine says 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.

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Phillips starred on TV's "One Day at a Time."

The magazine's Web site says Phillips writes: "I woke up that night from a blackout to find myself having sex with my own father."

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