Chains and whips aren't the only things that excite Rihanna, apparently live music festivals in the desert also do it for the "S&M" singer. The multi-tattooed pop star took in the Coachella action this weekend tweeting, "Coachella! Fun times... Arcade Fire, u f***in blew my mind! Felt like a kid again! U rock!!" The Barbados songstress opted to dress for the occasion in military attire — wearing an army jacket, a gun necklace, combat boots and what appear to be Beyonce's cutoff shorts from last year's music festival. Check out RiRi spending a little time off stage for once.