Katy Perry, Mick Jagger Perform 'Beast of Burden' at Rolling Stones Concert [VIDEO]: Songstress Tweets 'I Gyrated on Jagger, WHAT!' [PHOTOS]

During a Rolling Stones concert in Las Vegas on Saturday evening (May 11), "Fireworks" songstress Katy Perry joined Mick Jagger onstage for a surprise performance of "Beast of Burden." Following the stellar duet, Perry hit up Twitter to brag about her Stones encounter, tweeting, "I just gyrated on Mick Jagger. WHAT?!" Check out a fan-made clip from the show below!

Perry joined Jagger, Keith Richards, Charlie Watts, and Ronnie Wood and began dancing around the stage in a hot, black-and-white bustier getup during the Stones' hit song "Beast of Burden." Watch the performance here:

Following the concert, Perry excitingly tweeted:

@katyperry: "Yes, I just did gyrated on Mick Jagger. WHAT?! #Stones50."

When one fan called the songstress out on her improper linguistics, Perry tweeted:

@katyperry: "I noticed that. I guess I was too excited. Sorry mom. RT @izzyduval: @katyperry the grammar in that tweet is appalling Katy."

She also shared this TwitPic with fans:

@katyperry: "Mick & Kate forever! @MickJagger."

And...

@katyperry: "Thanks for letting me be the 5th wheel last night! @TheRollingStones."

What do fans think of the Perry and Jagger duet?