on `` The Oprah Winfrey Show '' that she engaged in an incestuous relationship with her father , legendary musician John Phillips , for nearly 10 years . In her tell-all memoir , `` High on Arrival '' -- named after a song her father dedicated to her -- she claims the relationship began in 1979 . She claims her father forced himself on her while they were under the influence of drugs on the night before she was to marry Jeff Sessler , a member of the Rolling Stones ' entourage . She ended the relationship a decade later , when she became pregnant and realized she did not know who had fathered her child -- her husband or her own father -- and terminated the pregnancy , the actress told CNN 's `` Larry King Live . '' Watch Phillips discuss her alleged incestuous relationship with her father '' But before the incest claims -- and subsequent denials from relatives -- Mackenzie Phillips was better known as a child actor full of promise who fell from grace under the toxic guidance of her drug-addicted father . Born Laura Mackenzie Phillips in 1959 to John Phillips and Baltimore socialite
-LRB- CNN -RRB- -- Actress Mackenzie Phillips has said that she believes she had a `` genetic predisposition '' to the life of sex , drugs and rock and roll that have come to define her . Mackenzie Phillips tells CNN 's `` Larry King Live '' that her father raped her in 1979 . In a 1999 interview on CNN 's `` Larry King Live '' on `` Why Some Childhood Stars Crash and Burn , '' the former `` One Day at a Time '' star said she did n't blame Hollywood for the years of drug and addiction she had endured . `` I think that for a lot of us , alcoholism and addiction is the root of the problem , not the fact that we were child stars , '' she said at the time . `` Certainly , it lent to the problem , but it was n't the root of the problem . '' By the time she did the interview , her well-publicized addiction to cocaine , drug arrests and stints in rehab had overshadowed an acting career once full of promise . Then , on Wednesday , the 49-year-old actress revealed