Former hellraiser Jack Osbourne is proud he has achieved four years without drink or drugs. The TV star ended up in rehab when he was just 17 after becoming addicted to 'hillbilly heroin' Oxycodone. Four years on, Osbourne is now a different person. He says, "I've been going strong for a little over four years now without a mind-altering substance. I know what it's like to drink and I know what it's like to do drugs - I don't need to remind myself."