By coincidence, You're So Vain is actually one of my favourite songs.

After throwing it on at work today, the two other directors on my bank of desks and I started the age-old debate: who is You're So Vain about?

One of the girls found this website. I had no idea that Mick Jagger sung the backing vocals on the song. I seriously must have heard it hundreds of times and I never noticed that, but once you know you can totally tell.

So it's pretty unlikely that the song is about Mick.

It's also pretty unlikely that it's about James Taylor, as she had only just married him (one month in) when the song went to number one in 1973.

And since then she has said that the guy's name features an A, an E and an R. Which rules out Kris Kristofferson.

Which must mean that it's Warren Beatty, surely!?

She's such a tease.