Rihanna teaches 'American Idol' finalists how to be a rock star

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?!

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