Burke, Lewis 'to perform at Cowell party'

Alexandra Burke and Leona Lewis have both been tipped to sing at Simon Cowell's 50th birthday party in Hertfordshire tomorrow.

The two X Factor winners could be joined by Il Divo and Westlife, the Daily Mail reports.

A source told The Sun: "Simon has made it clear he doesn't want presents. He's worried X Factor judges Dannii [Minogue], Cheryl [Cole] and Louis [Walsh] will start competing to see who can get him the most lavish gift.

"He's a very wealthy man already and just wants to make sure his nearest and dearest have a brilliant night."

It had previously been rumoured that supermodel Kate Moss would sing at the celebration, while Sharon Osbourne may also attend the party.