Have you had problems listening to R. Kelly ever since learning that he (allegedly) engaged in water sports with underage girls? Have you been forced to hit the fast-forward button on your Discman every time “Rock &Roll, Part 2” comes up while you’re listening to Jock Jams, because of Gary Glitter’s pedophiliac tendencies? Well, then, if you’re a fan of the Mamas & the Papas (and who isn’t?), we suggest you find something to do this afternoon that doesn’t involve watching Oprah. And just to be on the safe side, you might as well forget about reading newspapers and magazines, engaging your co-workers in conversations at the watercooler, or surfing the Internet for the next few days, as some very disturbing news about the late John Phillips has been making the rounds for the last few hours. You see, as part of an exclusive interview with Oprah, former One Day a Time star MacKenzie Phillips is going on the record saying that she had a long-term, mostly consensual sexual relationship with her famous father. We wish we had something else to add, but honestly we don’t.