Last night (May 11), the pop diva joined the Rolling Stones on stage at the MGM Grand Garden Arena in Las Vegas to duet with Mick Jagger on a rendition of their 1978 hit 'Beast of Burden.' Artists such as Gwen Stefani and Tom Waits have also collaborated with the Stones on earlier tour dates.The Stones announced the news of Perry's appearance yesterday on Twitter a few hours before the show. "I'm much obliged & quite honored!"