One of music's most long-standing mysteries has finally been solved -- sort of.

Carly Simon's been notoriously tight-lipped about the inspiration behind her mammoth hit "You're So Vain," often refusing to divulge who the song is about. But she's finally talking about the inspiration behind the track.

In an interview with PEOPLE just ahead of the release of Simon's upcoming memoir Boys in the Trees, Simon admitted, “I have confirmed that the second verse is Warren [Beatty].”

When asked whether Beatty has any idea that the song is partly about him she responded, “Warren thinks the whole thing is about him!”

But Simon refuses to relieve the track of all its mystery, saying the other verses are about two different men, and she has no intention of revealing who they are — at least not yet. When asked if she’ll ever make that information public Simon said, “I don’t think so, at least until they know it’s about them...Probably, if we were sitting over at dinner and I said: 'Remember that time you walked into the party and...' I don't know if I'll do it. I never thought I would admit that it was more than one person!”

If you're unfamiliar with "You're So Vain," here are the lyrics that directly reference Beatty:

You had me several years ago when I was still quite naive
Well you said that we made such a pretty pair
And that you would never leave
But you gave away the things you loved and one of them was me
I had some dreams, they were clouds in my coffee
Clouds in my coffee, and...

Listen to the full song in all its biting glory above.