He's already donned cut-off jeans and hot pink leg warmers to serve as aerobics instructor to the stars of Manchester United, and now James Corden's Smithy is dressing in much more revealing athletic gear.
In a new sketch for the Sport Relief charity, the Gavin & Stacey star squeezes into some tight-fitting swimming trunks before climbing onto the diving board alongside Olympic diver Tom Daley.
In the funny video, which will air March 19 on the BBC, James tries to give the young athlete some pointers on diving.
He will also star in a comic clip with racing star Jenson Button and is set to host the last two hours of the TV special.
Previous News In Pictures: