Katy Perry: 'Part of Me' on American Idol!

Katy Perry hits the stage to perform her hit song “Part of Me” on the American Idol results show on Thursday (April 26) in Hollywood.

“Me and 12 strong chicks dance it out military-style on @AmericanIdol tonight! Tune in to Fox at 8/7c! #PartOfMe #NightVision,” the 27-year-old singer tweeted.

Katy actually pre-taped the performance the night before after the live performance show ended.

“Has Jessica Simpson had that baby yet?! I’m getting anxious,” Katy tweeted earlier in the day.

FYI: Katy is wearing Army Surplus customized by Silvias Costumes and All Saints boots.