In September 2009, actress Mackenzie Phillips revealed to Oprah Winfrey that her late father, rock star John Phillips, raped her at age 18, sparking a 10-year-long consensual sexual relationship. Mackenzie Phillips, the former star of '70s-'80s sitcom "One Day at a Time," said she was first raped by her father, the lead singer of the Mamas and the Papas, in a hotel room while passed out after a drug binge. The relationship continued long after she married Jeff Sessler when she was 19-years-old, and ended only when she became pregnant and feared her father was the baby's father, Phillips said. Her father paid for an abortion. "I woke up that night from a blackout to find myself having sex with my father," Phillips said on "Oprah," reading an excerpt from her book, "High on Arrival." "I don't know how it started."