As if we needed more mystery surrounding the nameless egomaniac being sung about in "You're So Vain."
Carly Simon joined Taylor Swift onstage at Gillette Stadium in Foxborough, Mass., on Saturday night to duet on her 1972 hit, an ode to a bad beau that predated the types of relationship-postmortem tunes Swift would one day unleash on her unsuspecting (well, they should suspect now) exes.
"Every girl out there will be thinking of someone when we're singing," Swift told MTV backstage before showtime, discussing how excited she was to be taking the stage with Simon later.
"When I heard 'You're So Vain' I just thought, That's the best song that's ever been written," gushed the 23-year-old pop star. "That is the most direct way anyone has ever addressed a breakup. It's amazing."
"It's a song that really sort of developed that style of mine," Simon added. "And a lot of it was not knowing that I was developing that style, 'cause a lot of things happen by accident, don't you feel?"
"Yeah," Swift agreed, "especially with songwriting."
And the rest has been thinly veiled breakup-song history.
