Guest judge Katy Perry, who was meaner than Simon Cowell, and Kara DioGuardi (the shy bikini girl) had their disagreements while on the American Idol panel and the things got catty between the two. Katy was constantly picking on Kara, then Kara mocked her “I Kissed a Girl” hit and Katy threatened to throw a Coke in her face (must watch video below).

It was nasty! Cat fight! MEOW! And it only got worse during Chris Golightly’s audition (watch video here). While Kara loved him and was touched by his life story, Katy reminded her that, “This is not a Lifetime movie, sweetheart! You have to have talent!”

Kara is in trouble because Katy already expressed her desire to become a regular judge, saying, “The American Idol experience was awesome. If I was offered that job as a permanent host, I would ditch my career and take on that career. Idol was great fun. It was so easy. I didn’t really make anybody cry, but I did tell the truth to some kids that might have needed to hear it.” Keep Katy and get rid of Kara!!

Kara DioGuardi & Katy Perry Cat Fight On American Idol Video Below