Jack Osbourne is speaking out for the first time about his recent stint in rehab. The 17-year-old tells MTV in a special airing Tuesday at 11 pm/ET that he was addicted to the painkiller OxyContin and other drugs. "I was really loaded and I just sat on my mom's bed and I just said, 'I am going to go pack my bags,'" he recalls. "'I'm ready to go, I want to go, I need to go.'"