its one of musics greatest mysteries who is carly simmons your so vain really about. with speculation and the number one name being warren beaty who even has said its about him. or her ex james taylor for so long carly has never revealed the truth execpt to one guy who bought the rights to learn the secret for charity at least till now while promoting her book carly revealed the truth at least part of it that your so vain is about warren but only the verse that goes you had me many years ago. when i was navie. as for the rest she said its about some other guys too but won’t reveal their names ever till they proably figure out the song is about them. as carly reveals some of the mystery at last about yours. so vain is about. confirming some of it is about beaty as most have thought.