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Katy Perry Joins the Rolling Stones on 'Beast of Burden'

The Rolling Stones have been pulling up an all-star cast of surprise guests to join them on their "50 and Counting" tour, with collaborators ranging from Tom Waits to Gwen Stefani. Last night at the MGM Grand Garden Arena in Las Vegas, Katy Perry joined the band onstage to duet with Mick Jagger on the classic Some Girls hit "Beast of Burden."

The Stones spread the news of the pop star's impending appearance yesterday afternoon on Twitter a few hours before the show. "I'm much obliged & quite honored!" Perry tweeted in reply. After her appearance, which came six songs into the band's set, the exhilarated "Teenage Dream" singer took to the social network again, writing "Yes, I just did gyrated [sic] on Mick Jagger. WHAT?!"

This article originally appeared on Rolling Stone: Katy Perry Joins the Rolling Stones on 'Beast of Burden'