May 14, 2009, 11:40 GMT
Ben Stiller is like a "monkey" in nappies, says Ricky Gervais.
US actor and cast member Ben Stiller (L) and British actor and cast member Ricky Gervais (R) He joked: "I was winding Ben up by playing with Christopher. Ben and the monkey are very similar - small and hairy and they both wear nappies." EPA/DANIEL DEME
The British actor claims he has noticed similarities between his 'Night at the Museum: Battle of the Smithsonian' co-star and animal 'actor' Christopher the monkey.
He joked: "I was winding Ben up by playing with Christopher. Ben and the monkey are very similar - small and hairy and they both wear nappies."
Ricky admitted he loved poking fun at the 'Zoolander' actor, and did his best to put him off during filming.
He added at the UK premiere of the movie: "The idea was to put him off and make him laugh - the best thing about working with Ben was putting him off. He takes it so seriously and he's such a professional."
Ben will need to swap his diapers for more traditional underwear if he plans to join Ricky in his favourite pastime back in the UK.
Asked if he and Ben would be enjoying a night on the town, Ricky joked: "If 'out on the town' is both of us sitting on my sofa in pants, drinking wine, he's welcome because that's what I'm going to be doing."
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