Chaka Kahn, Neil Diamond and Reba McEntire perform on "American Idol"

Sporting a new, dreadlock hairstyle Rihanna performed her new single 'Where Have You Been' on a night that also saw performances from Neil Diamond, Chaka Khan and American Idol judge Jennifer Lopez. Tweeting about her new look, Rihanna told herSanchez will join Dreamgirls soul-mate Holliday for an encore performance of “And I Am

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