Rihanna turned down X-Factor

Rihanna has revealed she was asked to be a judge on American X Factor - but is too busy.

She told American radio station KIIS FM, "It’s something that I would have loved to do, actually. But our schedule doesn’t allow.

"We’re gonna be on tour for the rest of the year and it’s a demanding schedule to be on that show. You have to kind of be around for a long time, months at a time, which is impossible for me… I’ll be on tour for the rest of the year.”

So who will be on the judging panel? Well Simon Cowell has committed himself to the US show and music mogul LA Reid is a cert but what about Cheryl Cole...we still don't know.

The winner will receive a $5 million prize.