Carrie Underwood replaced Katy as a judge on 'American Idol,' but some fans miss the 'Teenage Dream' hitmaker. Find out why Katy left the show in 2024.

Why did Katy Perry leave American Idol ... She wanted to focus on other projects like her music. Filming American Idol takes a lot of time, and Katy felt she needed to focus her attention elsewhere.

Carrie Underwood was the obvious pick to join the judging panel after Katy Perry's exit, according to 'American Idol showrunner ...