Hilarious: Hollywood star and former American governor photobomb tourist in Paris.

Its not everyday you have an A list Hollywood actor and former governor of American state photobomb your picture. This is exactly what happened to a group of Thai tourist who were in the city of light and were about taking pictures at the popular Effiel tower.

Arnold Schwarzenegger stole the limelight from a group of tourists in the French capital, Paris. The Terminator star couldn't resist diving in front of the Thai visitors as they were posing for a group shot in front of the Eiffel Tower.

On a bike, in dark glasses, shorts and a camouflage jacket, the actor was understandably unrecognisable to them.

He later thanked them for "letting me crash your photo!"

One of the Thai group said he and his companions were about to smile broadly for the snap when someone "rode his bike in front of our shot".

The actor and former California governor who was biking through the French capital posted about it on Instagram with a special mention to the tourists. "Fantastic bike ride through Paris. I cannot say this enough: to truly appreciate a city, get on a bike.

The tourist, posting as Y-G2006, added: "I thought to myself, 'Hey, what a badass!'"

He also said he and his group had no idea at the time who the photobomber was.

It was only down to their guide shouting "Arnold" once Schwarzenegger had ridden off - accompanied by bodyguards on cycles and motorbikes - that they realised who they had been dealing with.