The Rolling Stones introduced fans to another country music superstar last night.
A week after playing alongside Carrie Underwood, the iconic group invited Taylor Swift on stage to join them for a rendition of "As Tears Go By" in Chicago.
The ballad was one of the first ever written by Mick Jagger and Keith Richards, though it was only performed live for the first time in 2005.
Watch Taylor take part in it now:
"Filing this under 'never in my wildest dreams'.Thank you @RollingStones for inviting me to Chicago to sing with you," Tweeted Swift after the concert.