I'm thinking the third one from Atomic Kitten, you know the only one that hasn't yet been on a "celebrity" show. Whatsherface, thingy, that one, her....
As well as the Hoffmeister I'd like to see Sue Pollard, Timmy Mallett, Bernard Manning, and Lee from Blue. The temptation to just leave them in there might be too much thogh (apart from the Hoff, he's cool!)