pop song, girl band

Heard it in the last 5 years in the uk, the chorus was something about "so you think that you're a rock star" and then rhymed rock star with "who you are". I think it was one of the girl bands with guitars and grr manufactured pop girl power , and I think I heard it on tv. The general gist of the song was that the singers boyfriend was full of himself beyond reason.

Try "Rock Star" by Sarah Slean

spice girls-who do you think you are (1996)