American Idol guest judge Katy Perry showed her snarky side during last night’s audition round in Los Angeles when she and judge Kara DioGuardi exchanged a few less than polite words.

Last night’s American Idol auditions in Chicago were some of the worst of the season so far, with only 13 of 12,000 hopefuls making it through to Hollywood. Although overall the audition show was kind of a downer, guest judge Shania Twain was a treat to watch.