Supermodel Kate Moss will make her theatrical debut in the Little Britain stage show tonight. Moss is appearing in a Comic Relief special alongside stars David Walliams and Matt Lucas.

Details of her role have been kept under wraps but she is rumoured to be appearing as a shell-suited pal of "yeah but no but" teenager Vicky Pollard.

The show, Little Britain's Big Night, takes place at the Hammersmith Apollo in west London. Walliams persuaded Moss to take part after she and boyfriend Pete Doherty went to see a Little Britain show.

"I've known Kate socially for a little while and she and Pete came to our show one night and liked it," he said. "So we thought, let's be cheeky and see if we can convince her, and she was up for it.

"It'll be a speaking role but I don't want to give too much away. When you see her and what she'll be wearing and doing, it'll be a big surprise."

Walliams believes the supermodel has a flair for comedy. "The thing about Kate is that she's funny in her own right so we think it'll be brilliant," he said.

Russell Brand and Jonathan Ross will also appear in the comedy show. All proceeds will go to Comic Relief. Walliams raised £1 million for the cause earlier this year by swimming the English Channel.