Simon Cowell is currently recruiting panelists for his latest reality TV project which will see him transfer his successful British talent show to the U.S.
Famed music mogul Antonio L.A. Reid is already confirmed, while high-profile names including Jessica Simpson and Nicole Scherzinger have been linked to the other coveted slots.
Rihanna has now become the latest star to confirm she turned down the chance to join X Factir and the singer admits she was upset when she realized her touring commitments would make the role impossible.
She tells radio host Ryan Seacrest, "Yes, 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."