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Saturday, May 25, 2013 | 1:32 p.m.

Katie Perry goes to war on American Idol

Katy Perry saluted the troops in a military-themed performance of Part Of Me last night on American Idol. Sadly, it was pre-recorded, leading to a chorus of boos from an audience that was beyond pumped for her to treat them to a live rendition of latest hit. Katy dropped on-stage from the ceiling in full sexy fake Marine fatigues and purple hair, which we're pretty sure violates military code.