Kate Moss 'to sing at Cowell party'

Kate Moss is planning to sing for Simon Cowell when she attends his 50th birthday party next month, a report has claimed.

According to the Daily Star, the supermodel is considering treating Cowell by belting out a surprise rendition of Lily Allen's song 'Not Fair' at the event.

A source told the newspaper: "It's a toss-up between a sexy Marilyn Monroe-style 'Happy Birthday', or her speciality 'Not Fair', which she's been practising with Lily Allen."

A total of 400 guests are expected to join Cowell when he celebrates the milestone birthday in October.

In July, an unofficial birthday party for Cowell saw Dannii Minogue singing 'You're So Vain' to the music mogul.