Katy Perry goes military on 'American Idol' as Jessica Sanchez's soldier dad watches

Katy Perry storms onto "American Idol," singing "Part of Me" dressed in camouflage short-shorts and a tank top, purple hair flying.

It's her usual high-energy, demanding performance ("let me hear you scream!"), all done up in faux-military style.

Wonder what Jessica Sanchez's dad, who's in the audience tonight before being deployed overseas for the third time, makes of it -- Perry is literally using dancers dressed up as soldiers as a backdrop.

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