Mick Jagger is three times older than Taylor Swift, but he'll probably be dancing rings around her tonight when she joins The Rolling Stones on stage in Chicago.

Taylor is the legendary rock band's special guest tonight for their concert, and Mick Jagger tweeted, "Looking forward to singing with @taylorswift13 tonight! Wonder which song we will do?"

As for what the connection is between Taylor and the Stones, the two acts share a producer: Grammy-winner Jeff Bhasker.

The Stones are currently out on their 50 and Counting tour, in celebration of their 50th anniversary, and have been welcoming special guests on stage throughout, including Sheryl Crow last week.  Gwen Stefani, Keith Urban, Dave Grohl of Foo Fighters and Katy Perry are among the artists who've sung or played with the Stones on this tour.