Uh, where do we even begin? Mackenzie Phillips has struggled with cocaine addiction for decades, even collapsing on set and being fired from her '70s show One Day at a Time. In 2008, she was arrested for cocaine and heroin after an airport screening and pled guilty to one count of felony cocaine possession. And then there's her memoir, High on Arrival, where she fesses up to first trying the powder at age 11. Oh, and she also accuses her father of injecting her with drugs and claims they had an incestuous relationship for 10 years. And in case you didn't already guess? Her father, John, struggled with addiction for years as well.