Catfight! Lady Gaga vs. Kelly Osbourne

In September 2012, Kelly Osbourne mentioned that she thought Lady Gaga's weight gain made her look pregnant. Then, in January Kelly revealed that she's still being called "fat" especially by Gaga's fans, kicking off an epic cat fight! Gaga and her mom posted a lengthy letter on her fan site criticizing Kelly for being on the snarky show Fashion Police. Then Kelly's mother Sharon jumped in responding with a lengthy letter sticking up for her daughter, Me-ouch!