Katy Perry understood the assignment ... When she appeared on stage, Perry appeared in a simple dress, but once she pulled a ribbon at the back, she spun out the gorgeous blue gown.

Katy Perry dazzled viewers on Sunday night during her second-to-last episode as a judge on American Idol, pulling off a show-stopping Cinderella gown transformation that left fans in awe.

Katy Perry pulled out ... She styled her hair down in a wet grunge look. At one point, the Grammy winner turned around to display a QR code tattoo on her lower back, which, when followed, prompts ...

Katy Perry is mourning the ... the light that you shined so brightly back here on earth. It’s just us that are left with a dimmer world without you.” Perry went on to share a quote about ...

Katy Perry is ... shined so brightly back here on earth. It's just us that are left with a dimmer world without you." View this post on Instagram A post shared by KATY PERRY (@katyperry) Perry ...