Rihanna's raunchy performances are known to be hot and fiery. But the singer's stage literally caught on fire last night during a concert stop in Dallas as part of her Loud tour forcing her to cancel her performance. The show started normally with the Bajan songstress singing and dancing on stage but when a light on a beam above the star set ablaze it caused panic in the American Airlines Center. Scary: Rihanna was rushed off the stage at the American Airlines Center in Dallas last night...