Taylor Swift Performs with Carly Simon During a Stop on her RED Tour [VIDEO]

The mega-star, Taylor Swift is continuing to pull in the $$$, relate to us with her song writing and surprise us with who joins her on stage.  This time, in Foxboro, MA, she brings Carly Simon on to sing Carly's hit "You're So Vain".  I think Taylor relates to the song because it's putting "someone" in their place.  A feat she's done with her songs many times.  They actually do very well together and Taylor asks Carly "who is THIS song about?"

Carly definitely has a style of her own, check out her outfit.  I guess it's been a few years since I've seen her perform, or maybe it's just age.  Watch the video and see if Taylor can coax Carly to finally tell us who "You're So Vain" is about!