katyperryaipreformance1_460.jpg Was the audience full of Russell Brand fans?!

Katy Perry "performed" her hit single "Part of Me" on last night's American Idol, but fans were kept in the dark up until the last minute about the fact that the musical number had been pretaped. When the video began to play, boos rang out in the crowd! The A.I crew should have at least had the decency to give fans a hologram version of their favorite pop star!

Donning sexy army fatigues and purple hair, the Teenage Dream singer belted out her latest hit and coordinated it with an extended nightvision military dance sequence.

Fear not, loyal KP fanatics! It was recently announced that the brunette beauty will perform at the MuchMusic Video Awards on June 17, and this time she will be there in the flesh!