Katy Perry brought a little pop to The Rolling Stones' show on Saturday night (11May13) by joining them onstage in Las Vegas. The Brown Sugar hitmakers continued their 50 & Counting anniversary tour by headlining at Sin City's MGM Grand, and they thrilled fans with a special guest. Perry performed a rendition of the Stones' track Beast of Burden, from their 1978 album Some Girls, and she took to her Twitter.com page to reveal she got up close and personal with singer Sir Mick Jagger. In a post on her page, she writes, "Yes, I just (sic) did gyrated on Mick Jagger. WHAT?!" The I Kissed a Girl hitmaker is the latest famous face to guest at a show on the band's tour - veteran rocker John Fogerty, Gwen Stefani, Keith Urban and Tom Waits have appeared at previous concerts.