American Idol's Mr Nasty judge Simon Cowell is famous for his catty comments on the hit show - and now he's targeting the world's biggest pop stars.

The British music impresario admits he's a fan of cher, Justin Timberlake, Eminem and Christina Aguilera, but he has some hard-hitting comments about BBritney Spears, Kelly Osbourne, Jennifer Lopez and Jon Bon Jovi.

Cowell says, "Britney isn't sexy and she doesn't know who she's aiming her music at anymore.

"People call J.Lo's actions diva-ish, but I call it spoiled and obnoxious.

"Kelly Osbourne is dreadful and Bon Jovi takes himself so seriously. It's a joke."