Pop-country singer Taylor Swift joined the Rolling Stones on stage during their Chicago performance Monday night.
Mick Jagger announced on his Twitter page prior to the show that he'll be performing with the 23-year-old singer, but questioned which song they will perform.
Looking forward to singing with @taylorswift13 tonight! Wonder which song we will do?— Mick Jagger (@MickJagger) June 3, 2013
The song of choice was "As Tears Go By" which, according to Jagger, the band hasn't played in a long time.
"It's almost the first song that Keith [Richards] and I wrote," Jagger announced to the crowd. "We didn't do it at the time, we gave it to someone else, a young lady, to sing."
The audience cheered as Swift took the stage, and the duet was a smashing success.
Lady Gaga, Katy Perry and Florence Welch are all among those who have previously performed along side the Stones on their 50 & Counting Tour.
Who will be next on the list? Rumor has it, it's Adele.