KELLY OSBOURNE has revealed she was a “full-blown drug addict” by the time she became a reality TV star in THE OSBOURNES - and the high-profile show only made matters worse.

The pop star daughter of Ozzy Osbourne has revealed she was experimenting with drugs when she was as young as 13, and was wasted while she was shooting the hit show in her late teens.

In a candid chat with U.S. TV presenter Ellen DeGeneres, which aired on Monday (21Sep09), Osbourne said, “By the time we started doing The Osbournes I really was a full-blown drug addict.

“It was at a time in my life where suddenly I was famous, my mum had cancer, my dad almost died in a bike accident, so I was going between a hospital in London and a hospital in L.A… (and) I’d open magazines and it would be like, ‘The fat daughter of Ozzy Osbourne.’”

She also struggled with the abuse she received at the hands of jealous critics: “People would drive past our house… and scream, ‘You’re fat and ugly, we hate you!’ And it would be, like, consistently every Friday and Saturday night. It was a lot for me to handle and I didn’t handle it very well.”

Looking back, she wishes she had been more open about her drug problems with her mum, Sharon, but she felt so ashamed.

She explained, “My mum had been in a relationship with my father for years and years and years when she tried to get him sober, and I was completely ashamed that I would have to go to her and tell her that her daughter had issues as well.

“I wanted to tell my mum so bad and I knew she kinda knew, but I felt like such a horrible daughter because I felt like I’d let her down.”