Rolling Stones

Fans at the Rolling Stones’ latest round of tour dates have been treated to an array of special musical guests, including pop singer Katy Perry, Foo Fighters frontman and former Nirvana drummer Dave Grohl, country singer Keith Urban, alternative pop-rock singer Gwen Stefani and more.

Now, the Stones have added another big name to their ever-growing list of guest talent: Taylor Swift.

Swift joined the band Monday night (June 3), during their show at Chicago’s United Center. The young country-pop singer and Stones frontman Mick Jagger sang an acoustic version of “As Tears Go By,” with Keith Richards on acoustic guitar.

Swift, of course, had a blast singing with Jagger. After the show, the singer tweeted, “Filing this under ‘never in my wildest dreams.’ Thank you Rolling Stones for inviting me to Chicago to sing with you.”