Former wild-child Kelly Osbourne has beaten a decade of drug and alcohol abuse - even though she was an addict as a 13-year-old. The singer/reality TV star admits during her childhood she was at one point was taking up to 100 pills a day, but after three stints in rehab, she is now clean. But Osbourne insists it was difficult to eventually kick the habit. She says, "All the voices in my head were telling me I was worthless."