Who Joined Taylor Swift on Stage in NYC?

It really is Taylor Swift's world. We just live in it.

A couple days after cleaning up at the American Music Awards, this 21-year old sensation hit the road again, crossing the country and appearing at Madison Square Garden for fans in New York City. And, as usual, the artist invited a special, local guest to perform a track with her.

The lucky participant on this night of the Speak Now tour? Johnny Rzeznik of the Goo Goo Dolls. He came out and performed a version of "Iris" that had the crowd both on its feet and singing along. Watch the pair strum along together now:

Taylor Swift and Johnny Rzeznik - Iris (Live)