Kelly Osbourne slams 'fat' Christina Aguilera

Kelly Osbourne has slammed her famous foe Christina Aguilera during a recently taped episode of her catty show E!'s Fashion Police.

As comedienne and co-host Joan Rivers poked fun at Aguilera's look at a fashion party in Germany in July, Osbourne decided to go a few steps further in firing up her feud with the pop star.

She snarled: "Maybe she is just becoming the fat b**ch she was born to be. I don't know. She was a c**t to me. And she bought my house!"

In an attempt to justify her outburst, she continued: "She called me fat for so many f**king years, so you know what? F**k you! You're fat too."