Christina Aguilera a ‘Fat Bitch,’ Says Kelly Osbourne

Kelly Osbourne- not known for a shy, retiring demeanor- has laid into longtime enemy Christina Aguilera on the red carpet after Joan Rivers set her off.

Osbourne- who lost a ton of weight after appearing on the physically grueling Dancing With The Stars– indicated that maintaining her weight loss while Aguilera has gained weight is a bit satisfying:

“Maybe she is just becoming the fat bitch she was born to be. I don’t know. She was a c**t to me. And she bought my house!

…She called me fat for so many f***ing years,” Osbourne continued, “so you know what? F**k you! You’re fat too.”

Osbourne spoke about keeping pounds off in October last year, and said that a brief workout routine is all she needs to stay in shape:

“I just commit to half an hour a day. It doesn’t seem overwhelming and I can handle that… I do half an hour on the treadmill and when I feel like doing more, I’ll do a few sit-ups and some weights.”

Osbourne also said she was criticized more for her weight than for her struggles with drugs and alcohol.