Jennifer Lopez to appear on 'X Factor'?

Simon Cowell has asked Jennifer Lopez to mentor the X Factor finalists later this year.

As was the case in last year's series, Cowell has plans for a different star to advise the contestants each week. They will also perform and offer their comments on the Saturday night live show.

According to The Sun, Lopez, Celine Dion and Sir Elton John have been approached to appear. Producers are also in final talks with Kylie Minogue, who was asked to get involved by her sister Dannii after she joined the judging panel.

The third series saw stars including Take That, Westlife, Rod Stewart and Lionel Richie appearing on the show.