Ever since she lost 48 pounds on Dancing with the Stars, Kelly Osborne has gone through a complete transformation and managed to keep the weight off. But she still remembers when she was called fat.  She told Us Weekly last year, "I took more hell for being fat than I did for being an absolute raging drug addict. I will never understand that." That didn’t stop her from being harsh on Christina Aguilera during a recent episode of E!’s ‘Fashion Police’. Joan Rivers commented that Christina looked like Snooki’s cousin stuffed into some dress, and Kelly just started going off about how Christina used to call her fat and now she is just a fat witch! But Christina actually started the fat feud several years when bashing Kelly’s weight while she was on her reality show, ‘The Osborne’s’. She’s made several remarks about Kelly’s weight, and I guess Kelly was just waiting on the perfect opportunity to strike back!

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