Rihanna comes out to mad applause to sing "Rock Star 101" on "American Idol." She puts on a heck of a show, of course; totally owns the stage in her catwoman outfit, you cannot look away.

She sings so effortlessly, throws away her mike into the audience towards the end  and wails on the guitar. Big smile at the end; awww, no chat with Ryan?!

PHOTOS: "American Idol" final round | "Idol" top 12 party with "Glee" stars

REWIND: See the winners and top finalists from each season of 'American Idol'

MORE: Read all of our other 'American Idol' posts

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