American Idol Catfight: Katy Perry & Kara Dioguardi!

Oops! In case you missed it, Katy Perry was a guest judge on American Idol this past week and she was feeling no love for her fellow judge Kara Dioguardi! The two women disagreed on almost every contestant and it eventually got ugly! Kara started using lyrics from Katy's hit songs to tease her and Katy ended up threatening Kara, warning her she would throw her coke in Kara's face if she didn't stop! Meaow! Take a look: