The roof, the roof, the roof is on fire. No, seriously. The roof actually was on fire when flames erupted at Rihanna's "LOUD" tour concert stop at the American Airlines Center in Dallas last night. It all happened when a light high above the stage caught fire when the red-headed singer performed "California King Bed" after exiting the stage. Luckily, she wasn't hurt, the fire was put out, and she took to Twitter to humoursly tweet about the incident.