Katy Perry's teenage dream has been fulfilled. The 28-year-old singer joined The Rolling Stones on stage to perform a duet with Mick Jagger at their MGM Grand Garden Arena show in Las Vegas on Saturday, May 11.

A few hours before their 50 and Counting tour performance, the band announced that Perry would be making a special appearance. "I'm much obliged and quite honored," the "Wide Awake" singer responded.

For her guest duet, Perry took the stage in a sexy leather dress and tall boots to sing the band's 1978 classic "Beast of Burden" with Jagger, 69. After the show, she couldn't contain her excitement.

"Yes, I just did gyrated on Mick Jagger. What?!" she tweeted. "Stones 50." When a fan called her out on her poor grammar, Perry wrote back, "I noticed that. I guess I was too excited. Sorry mom."

Perry also posted a picture of her performing with Jagger, and captioned the snapshot, "Mick & Kate forever!" In a group photo with The Rolling Stones, Perry wrote, "Thanks for letting me be the 5th wheel last night!" 

Watch the video of Perry's duet with Jagger above and tell Us: How do you think she did?