Former hellraiser Jack Osbourne is proud he has achieved four years without drinking or doing drugs. The star ended up in rehab when he was just 17 after becoming addicted to 'hillbilly heroin' Oxycodone. Four years later, 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."

-Jack Osbourne Pictures

(This news article provided by World Entertainment News Network)