Worth: £8m

Born in Georgia, raven-haired Katie moved to Belfast at the age of eight. Her 2003 album 'Call Off the Search' is one of the most succesful debuts by a British artist. While her follow-up 'Piece by Piece' also reached No 1. As well as working on a new album, she's made her film debut in 'Grindhouse', Tarantino's new flick.

Impress her by: Telling her an interesting fact she can write a song about. Such as how many tractors there are in Devon.