Gillian Anderson and a conger eel
Gillian Anderson of X-Files fame and other (mostly European) celebrities and models recently posed nude with a grouper, conger eel, and even a mako shark for FishLove, a campaign to promote sustainable fishing. I think the facial expressions (of both the people and the fish) are keepers. French photographer Denis Rouvre shot the entire series for FishLove which can be viewed at their site.
Caroline Ducey and a barracuda
Jean-Marc Barr and a mako shark