Uh oh this isn't going to go down weell.
Everyone knows that Kelly Osbourne and Christina Aguilera used to hate each other, and it looks like their fight may be re-ignited.
While on the reality show The Osbournes, Kelly constantly moced Christina's clothing style, saying she was trashy and llooked like a whore.
Back at the MTV Europe Music Awards in November 2003, the network even aired a skit of Christina throwing darts at a photo of the British personality. When she took the stage, she mocked Ozzy's daughter right back, saying: "Oh Lord, I didn't realise it was still Halloween."
But now it looks like Kelly has got her own back, check out what she said on Fashion Police!
