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It appears that popstress Rihanna thought the Underage People's Choice Awards required a costume:

She is dressed as An Extra From That Episode of Fame Where Doris Was Unable To Concentrate On Her Tap Class Because She's In a Fight With Coco and Then Debbie Allen Yells At Them And They Manage To Pull Both Their Friendship AND Their Routine Together in the Final Act. 

Because apparently, being the Kids' Choice costs, and here is where Rihanna begins paying. In sweat.