Rihanna set for American Idol

Rihanna's ready for a dose of reality TV.

Ri-Ri has agreed to sing on the next week's American Idol results show.

She'll be joined by Kelly Clarkson who won the competition back in 2001. Kelyl will perform 'Don't You Wanna Stay' with Jason Aldean.

Rihanna will sing one of the tracks from her 'Loud' album.

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