Airplanes B.o.B feat. Hayley Williams
He's an actor, a TV talent show judge, and he's really good at running along beaches. Yep, David Hasselhoff was on the show!
Dan and Katy chatted to the Hoff about his Baywatch days, the crab that's been named after him, and the time he sat in a chair and had people hurl abuse at him for an hour.
He was an awesome guest - hear the full thing below!