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Katy Perry is the latest surprise guest to show up on stage with the Rolling Stones.  On Saturday, the pop star joined the legendary rockers for a stop on their "50 and Counting" tour at the MGM Grand in Las Vegas, on their hit "Beast Of Burden." 

Katy confirmed that she'd be the night's special guest just a few hours before taking the stage, tweeting that she was "much obliged and quite honored" to be their pick this week. After her performance, she took to Twitter again raving about having had just "gyrated on Mick Jagger."  

Other artists who have joined the Stones on their tour so far include Gwen Stefani, Keith Urban, and Tom Waits. 

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