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Prince William and Kate Middleton giggle their way through the teen comedy.
Yesterday it was announced that The Inbetweeners had the highest grossing weekend for a UK comedy and now it's been given the Royal seal of approval.
Movie-goers were amazed to see the heirs in attendance for the film that has it's fair share of racy scenes.
"The film is hilarious but about as crude and embarrassing as you can get. At one point I was cringing so much I had to look away, then saw Wills and Kate, an eyewitness told The Sun.
"You'd never have expected them there. But they were loving it and were in hysterics through the whole film. Their regal position obviously hasn't affected their down-to-earth sense of humour."
The film has currently taken over £13m, beating the record set by Bridget Jones: The Edge of Reason, which took just over £10m in its opening weekend.
Royal seal of approval: The cheeky chap's antics had Will and Kate laughing out loud.