Mariah isn’t the only rumored diva allegedly tossing her weight around the industry: Rihanna kept hundreds of fans in the Big Apple waiting in the blistery cold on Monday night after arriving three hours late to a record-signing event at a local Best Buy. Rihanna has been scheduled to greet fans and sign copie of her fourth LP, Rated R, at the store in Manhattan’s Union Square at 5PM, but the songbird didn’t show up until after 8PM — leaving fan battling heavy winds for a glimpse at their beloved Barbadian.