Kelly Osbourne says she is finally free of an addiction to painkillers that she has dealt with since she was 13-years-old.

"I had my tonsils taken out [at age 13], and they gave me liquid Vicodin," the now 24-year-old star of Fox's upcoming Osbournes: Reloaded told People. "I found, when I take this, people like me. I'm having fun, I'm not getting picked on. It became a confidence thing."

However, although she underwent two stints in rehab in 2004 and 2005 to try and kick the addiction, Osbourne added that it wasn't until a recently completed third month-long rehab stint that she was finally able to rid herself of her reliance on painkillers.

"I knew if I didn't get help, I would die," she told People.

Now clean and preparing for the premiere of Osbournes: Reloaded on Tuesday, March 31 at 9PM ET/PT, Osbourne said she is looking forward to refocusing on her career.

"I'm getting a second chance [at my career]," she says, "And I want to be present for it."

In January, matriarch Sharon Osbourne revealed that  Kelly had re-entered rehab but did not disclose the reasons for her admission.

"Yeah, Kelly's in rehab," Sharon told Radar Online at the time. "What else can we say? She knew that it was the right thing to do at this point and we're proud that she did it. The family is all standing behind her. Kelly knew that she needed help and she's getting it."

"We just pray that everything's going to be okay," she said.

The rehab announcement also came only days after Kelly had been arrested and charged with common assault on January 2 for allegedly slapping a woman at a London nightclub last August.