Kelly Osbourne Goes After Christina Aguilera: “You’re Fat Too!”

Kelly Osbourne let loose on Christine Aguilera during a recent taping of E!’s “Fashion Police.”

Osbourne, who strugged with her weight in earlier years initially was tight lipped when Joan Rivers poked fun of Aguilera’s look at a German fashion party in July – but not for long… unearthing what appears to have been a history of hurt feelings and barbs from Aguilera.

When Rivers mentioned that Aguilera looked stuffed into her dress, Osbourne let loose:

“Maybe she is just becoming the fat b**ch she was born to be. I don’t know. She was a c*** to me. And she bought my house! … She called me fat for so many f***ing years, so you know what? F*** you! You’re fat too.”