Sarah Palin and her brood are already taking cover in preparation for a pile of sex and drug accusations to be published in Playboy next week. The magazine features a racy photo spread and equally incendiary interview with Mercede Johnston, the sister of Levi Johnston, who fathered Bristol Palin’s son Tripp. Mercede claims that Track, whom she briefly dated, was addicted to drugs. “He did Oxycontin but mostly cocaine,” she says. She also dishes to Playboy about Bristol's alleged naughty habits, including reportedly “stealing her parents’ credit cards to order clothes,” “chasing after men and partying,” and sending nude photos of herself to her male admirers. The allegations of Track’s drug use are particularly controversial, given that his wife of three months had a baby girl just last weekend.