Taylor Swift And Carly Simon Sing "You're So Vain" (VIDEO)

Taylor Swift was joined onstage by the iconic Carly Simon at her Foxboro concert on Saturday night.

Swift, 23, and Simon, 68, performed a duet of Carly's popular track: "You're So Vain."

Simon's song was rumored to be written about Warren Beatty, but the question is: "Whom did Taylor Swift have in mind while performing Carly Simon's song?"



Check out the video below... 



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