Commenting on a photo of Xtina wearing a tight black dress, Kelly quipped, “Maybe she's just becoming the fat b---ch she was always born to be. I don't know. She was a c--- to me.”
Don't hold back Kelly!
“She called me fat for so many f--king years, so you know what? F--k you, you're fat too!” the 26-year-old added.
The pair have been feuding for years after Christina mocked Kelly from the stage at the 2003 MTV Europe Music Awards, saying, “Oh lord, I didn't realise it was still Halloween.”
Fashion Police host Joan Rivers also had a catty remark to make about Christina's dress... “She looks like Snooki's Scandinavian cousin,” Joan quipped. “It's a pretty dress but she's stuffed into it.”