Whitney Houston can't deny it anymore: She has a problem. The Grammy-winning diva has entered a drug-rehabilitation facility, confirms her publicist, who adds that the singer "thanks everyone for their support and prayers." During a 2002 sit-down with Diane Sawyer, Houston admitted that she had abused drugs in the past, but insisted she had cleaned up her act through prayer. "I partied a lot. Trust me: I partied my tail off," she said. "You get to a point where you know the party's over." Houston's other problem, hubby Bobby Brown, is currently serving a 60-day prison sentence in Georgia on a probation violation. Where does all this leave the couple's 10-year-old daughter, Bobbi Kristina? In therapy for life.