The former Baywatch star is among the celebrities taking part in the annual event, in which a host of famous faces drive luxury cars across the world, and the Gumball regular is racing across the globe in a modernised version of his high-performance sidekick Kitt, a car fitted with artificial intelligence which featured in the hit 1980s show.
However, Hasselhoff ran into a little trouble with cops after he was spotted travelling at high speed, and the actor admits his usual charms failed to convince the officers to let him go with a warning.
He explains, "Police pulled me over, for speeding.
"Normally on Gumball, when I get pulled over by the police, I have a photo with them and they let me off. But not this year.
"I told them that it wasn't my fault, because Kitt drives itself!"
More than half a million fans turned out to cheer on the celebrity drivers as they pulled up on London's Regent Street on Sunday for the U.K. leg of the world's biggest rally.
The famous shopping district was shut down for the day to allow the fleet of supercars to pass through, with other star participants including rappers Eve, Xzibit, Dizzee Rascal and Tinie Tempah, dance DJ Deadmau5 and British Tv host Jonathan Ross.
The Gumball rally continues across Europe, with the finish line set in clubbing Mecca Ibiza, where Gumball founder Maximillion Cooper will wed Eve.