"You're So Vain" is a song written and performed by Carly Simon released in December 1972.
The song is a critical profile of a self-absorbed lover. The song was a number-one hit (it topped the Billboard Hot 100 for three weeks in early 1973, and also spent two weeks at the top of the Adult Contemporary chart, her first #1 song on either chart), and spawned what many fans consider to be the biggest musical mystery of the era. There has been much debate over whom exactly the song is about. Popular guesses on the subject include Mick Jagger (who sang uncredited backing vocals on the song), Cat Stevens, Warren Beatty, Kris Kristofferson (with whom she had had brief relationships), unfaithful fiancé William Donaldson, and Simon's ex-husband, James Taylor.
