Taylor Swift surprised fans at The Rolling Stones concert in Chicago this week, hopping on stage to perform "As Tears Go By." Swift and Mick Jagger sang, danced and grasped each other's hands while performing the slow song, which the band recorded in 1965.
Jagger, who turns 70 in July, teased the performance on Twitter to his 486,000 followers.
Looking forward to singing with @taylorswift13 tonight! Wonder which song we will do?— Mick Jagger (@MickJagger) June 3, 2013
Meanwhile, 23-year-old Swift tweeted photos of the experience to her 28.7 million followers.
Filing this under 'friends forever'. @mickjagger twitter.com/taylorswift13/…— Taylor Swift (@taylorswift13) June 4, 2013
Filing this under 'never in my wildest dreams'.Thank you @rollingstones for inviting me to Chicago to sing with you. twitter.com/taylorswift13/…— Taylor Swift (@taylorswift13) June 4, 2013
The Rolling Stones returned in 2012 -- after a 7-year hiatus -- to celebrate playing their first gig 50 years ago. The English rockers' comeback song, "Doom and Gloom," featured lyrics about zombies and exploding heads.
The Chicago concert was part of the band's "50 & Counting Tour," which ends in July.