Christina Aguilera is the latest name to be linked with the US X Factor judging job.

It was thought that Cheryl Cole was a dead cert for one of the spots alongside Simon Cowell. However there are now reports that show bosses in the States are having second thoughts.

A source claims, "Although Simon is desperate for Cheryl to join him on the judging panel, bosses just aren't convinced. Both Rihanna and Katy Perry have been mentioned as possible candidates but neither would be able to take time out of their busy work schedule to be judges.

"Christina is the one all bosses are agreed on. She has it all; looks, talent and she isn't afraid to speak her mind. She is a massive star globally and her voice is recognised as one of the best of all time so there really isn't any competition especially where Cheryl is concerned."

Christina performed on the UK version of the talent show in December 2010.

Meanwhile, it is being reported that Simon Cowell is only going to be involved in the live stages of X Factor UK as he wants to concentrate on the US version.

However, ITV are thought to be so keen to keep him, they have offered to pay for a private jet to whisk Simon to and from the States so he can do both shows simultaneously.