JOHN Mayer was ''humiliated'' by Taylor Swift's song about him.

The guitarist was reportedly the inspiration behind his former lover's track 'Dear John' - which came out a few months after he was slammed for branding ex-girlfriend Jessica Simpson ''sexual napalm'' - but he is upset about the record, saying it was a ''lousy'' thing to write.

He told Rolling Stone magazine: ''I was really caught off-guard, and it really humiliated me at a time when I'd already been dressed down.

"I mean, how would you feel if, at the lowest you've ever been, someone kicked you even lower?

''It made me feel terrible. Because I didn't deserve it. I'm pretty good at taking accountability now, and I never did anything to deserve that. It was a really lousy thing for her to do.''

The song was included on Taylor's multi-million selling 'Speak Now' album, and features cutting lyrics, including: ''Dear John, I see it all, now it was wrong / Don't you think 19 is too young / to be played by your dark twisted games, when I loved you so?''

John had a brief relationship with Taylor before 'Speak Now' came out, and shortly afterwards he took two years away from music to deal with some vocal problems.

The 34-year-old musician - who has also dated other beauties including Cameron Diaz and Jennifer Aniston - also took aim at Taylor for writing the song and it being so obviously about their relationship.

He added: ''I will say as a songwriter that I think it's kind of cheap songwriting.

''I know she's the biggest thing in the world, and I'm not trying to sink anybody's ship, but I think it's abusing your talent to rub your hands together and go, 'Wait till he gets a load of this!' That's bull****t.''