Katy Perry dressed as Cinderella for Disney night on Sunday's 'American Idol.' It's the end of an era, and Katy Perry plans to go out with a bang! As the 39-year-old pop star prepares to exit American ...

Katy Perry has said goodbye to American Idol… for now. The 39-year-old pop star ended her seven-year reign on the hit music competition show on Sunday, saying her goodbyes in a tear-filled episode.