Heidi Klum, Beyonce Knowles and SEAN 'DIDDY' COMBS are among a host of stars who have posed for portraits to back the fight against colon cancer.

The stars, along with designer Michael Kors and US newswoman Katie Couric, have posed for the shots which will be auctioned off on website eBay for the Entertainment Industry Foundation's National Colorectal Cancer Research Alliance (NCCRA).

Klum, who posed with Kors for her shot, says "If we can bring attention to NCCRA through fashion, that's something I'm proud to do."

The photographs, shot in February (05) by TIMOTHY GREENFIELDSANDERS, will go on sale Friday (09SEP05).

The NCCRA was founded by Couric, whose husband JAY MONAHAN died of colon cancer in 1998.