Katy Perry has just completed a space mission which has me convinced that American Idol was right to replace her with Carrie Underwood.

A source shared how Katy Perry allegedly feels about returning to 'American Idol' -- and how she hasn't watched Carrie Underwood judge.

Some American Idol fans are expressing discontent with Carrie Underwood on the show's judging panel, the latest blow to the show alum who is also being accused of "ruining" the show. Underwood, who recently surprised with a familiar dress on a recent episode,