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According to The Sun, the actor was originally due to drop his own trousers for the dance scene in the 20th Century Fox film, which stars Jack Black in the title role.
A source said: "James was showing off a bit in front of the extras and making everyone laugh.
"But he got the hump when the director reminded him that there would be some close-ups of his backside."
They added: "James really didn't want to do it and there was a bit of a set to. Eventually the director decided he would hire a body double to save his blushes.
"It took a while to find someone who had the same full figure. In the final film you will not realise that it's not James."
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