Monday night at Chicago's United Center Taylor Swift checked a performance with the Rolling Stones off her bucket list.  The country/pop princess joined the legendary rockers for an acoustic rendition of 'As Tears Go By'.  Check out video from their collabo and watch TSwiz hold her own with Mick Jagger.

Keith Richards played acoustic guitar for Swift and Jagger as they sang.  Rolling Stones have been welcoming several famous musicians to the stage during the course of their current 50 and Counting Tour, including Sheryl Crow, Katy Perry, Gwen Stefani, Keith Urban, and Foo Fighters' Dave Grohl.