However one thing you should recognise is his voice, because he's actually Olaf from ‘Frozen’, who is arguably the most snowman in the world.
In the latest episode of his US chat show, James began his opening monologue as usual, only to find the green room, where guests like Josh should be residing, empty.
Back in the studio, Josh was sat in the audience, and within minutes he was on his feet, helping James belt out a tune... a re-worked version of 'Do You Want to Build a Snowman?'.
Earlier this week, he demonstrated the best way to relieve red light boredom, by performing a few tracks from ‘Grease’ for drivers stuck in LA’s traffic jams.
Watch James and Josh’s duet above…