Kelly Osbourne and Christina Aguilera have been feuding off and on for nearly a decade, but now that Kelly is opining on celebrity fashion for E!’s ‘Fashion Police’, the daughter of Ozzy renewed her battle with the pop star.

Host Joan Rivers remarked that Aguilera looked “stuffed into” a Givenchy LBD at an event in Munich, Germany last month, likening the 30-year-old to “Snooki’s Scandinavian cousin”. In response, Kelly said, “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!” Aguilera purchased the home ‘The Osbournes’ took place at in 2008 for about $11 million. Christina recently put the home on the market for $13.5 million, according to TMZ.

Newly slimmed Osbourne also delighted in ribbing Aguilera for her expanding waistline. “She called me fat for so many fu**ing years,” Osbourne added, “so you know what? Fu** you! You’re fat too.”