Katy Perry joined Mick Jagger on stage at the Rolling Stones Concert in Las Vegas on Saturday. The singer accompanied the band on stage for their "50 and Counting" tour and sung "Beast of Burden" with Jagger.

The concert which took place at Sin City's MGM Grand surprised fans with special guest, Katy Perry. Perry performed the rendition of the Stones' song "Beast of Burden," from the band's 1978 album "Some Girls."

The newly singer later tweeted, "Yes, I just did gyrated on Mick Jagger. WHAT?! #Stones50."

She also tweeted a photo of herself and Stones band members, Mick Jagger, Keith Richards, Charlie Watts, and Ronnie Wood with the caption, "Thanks for letting me be the 5th wheel last night!" In the photo Perry was wearing thigh-high boots, a white skirt and a black bustier.

The 28-year old singer was honored to perform with band and even tweeted a picture of her and Mick Jagger during their set with the caption, "Mick & Kate forever!"

The Rolling Stones announced that the pop star would grace the stage a few hours before the show and the star tweeted, "I'm much obliged & quite honored!"

According to the Huffington Post, "the Stones have been keeping fans guessing on their '50 and Counting' tour," so far surprise guests have included John Fogerty , Keith Urban, Gwen Stefani and Tom Waits."