The Social Climber: 'You're So Vain' a Hit for Taylor Swift and Carly Simon

ABC NewsThe Social Climber: 'You're So Vain' a Hit for Taylor Swift and Carly SimonABC NewsSaturday night, Taylor Swift, writer of love songs about ex-boyfriends, was joined by the artist who practically created the genre when Carly Simon appeared at Swift's Massachusetts concert to sing "You're So Vain." Check out the behind-the-scenes ...