Usher & Rihanna: Dance Off At Coachella

 Usher and Rihanna heated up Coachella this weekend, party-hopping and catching all the big acts with a slew of other celebs. And it looks like the desert heat sparked a connection between the R&B superstars. OK! has the exclusive scoop on this hot-new-couple alert!  On Saturday, Usher and Rihanna both hit up the Armani Exchange A|X and 944 magazine party — called the “Neon Carnival.” “Usher