Kelly Osbourne on Christina Aguilera Weight Gain: I Was Never THAT Fat ...

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Kelly Osbourne really does not like Christina Aguilera. She's come out hard against the singer's weight again, saying she was never as fat as Christina is now.

Just two months ago, the E! Fashion Police co-host blatantly called Aguilera a fat bitch and the c-word to boot. Osbourne has never been one to mince words.

When co-host George Kotsiopoulous defended Christina's get-up at the Michael Jackson tribute concert, saying she's "still probably a size 2/4," Kelly scoffed.

"Trust me," she sniped. "I'm a 2/4. That is not a 2/4. I was never that fat."

Christina Aguilera Weight Gain
Thin Christina Aguilera

Christina Aguilera at this month's concert and in January 2010.

The Voice judge has been the source of criticism for pairing a tight-fitting black bodysuit with fishnets, heavy-handed makeup and massive hair at the show.

It's unclear exactly why Osbourne hates her so much, but this summer, she said, "She called me fat for f*cking years, so you know what? You're fat, too."

What do you think? Has Christina Aguilera put on weight recently, and does it matter? Does she look better now? Should Kelly Osbourne shut her yap?

Leave your comments on this vitally important celebrity feud below.

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