Katy Perry
The "Teenage Dream" singer is leaving the singing competition after seven seasons with the show.
The judge is in her final season, and she's leaving behind a memorable moment.
Clarkson performed a stunning rendition of the popular track.
The pop star's outfit at the Billboard Women in Music honors had several wild retro touches.
WHAT'S HAPPENING
Perry judged a hopeful who covered her song, "Rise."
The "American Idol" judge attended the monarch's coronation last May and accidentally became an instant meme.
The pop star said fellow judges Luke Bryan and Lionel Richie would learn the news when they saw the talk show.
Katy Perry explained why "I Kissed A Girl" doesn't age well.
In 2013, Perry made some ambiguous remarks about Brand, whom multiple women have now accused of sexual assault.