Michael Fassbender visited the 'Life's Too Short' set.
The Hollywood actor has been hanging out behind the scenes of Warwick Davis, Ricky Gervais and Stephen Merchant's BBC Two sitcom after being invited by Val Kilmer, who has a cameo role on the show's last episode.
A source told DigitalSpy: "Fassbender and Kilmer were just hanging out with everyone on set and really enjoying themselves.
"It was amazing to see these Hollywood stars on the same set as the show's British TV stars like Les Dennis, Keith Chegwin and Shaun Williamson."
Val reportedly asked producers whether he could bring a friend along and the cast and crew were gobsmacked when the high profile 'Shame' actor turned up.
However, the show's diminutive star Warwick had no idea who Michael was when he first showed up.
He confessed: "I didn't know it was him. He was just introduced to me as Michael and I just said, 'Alright Michael'. He probably just thinks I'm really cool now."
The mockumentary follows 'Harry Potter' actor Warwick in his daily life and sees British funnymen Ricky and Stephen appear in supporting roles as themselves.
The popular comedy has featured a host of celebrity cameos in the past including Liam Neeson, Helena Bonham Carter and Johnny Depp.