The 24 year-old singer jetted out of London to perform on the results show of the live final, held in Los Angeles' Nokia Theatre.
She wore a head of new, dark dreadlocks along with a tight, two-piece costume, which was embellished with feathers and black strings, to perform new single Where Have You Been. The singer was flanked by a group of female dancers in dark, tribal designed costume.
Rihanna begins her performance on the reality series finale
American Idol Judge Jennifer Lopez also performed the track Follow The Leader on the finale show alongside Wisin and Yandel.
The 42 year-old mother-of-two showcased her slim figure in a two-piece costume. Lopez was recently named the most powerful celebrity in the world by Forbes Magazine.
Jennifer is about to embark on a World tour alongside fellow singer Enrique Iglesias. The tour will stop in Dublin's O2 Arena on Friday October 19th.