The Twilight movies are full of lots of serious stuff - big fight scenes, vampire stares and sultry kisses.
But according to star of the vampire franchise Peter Facinelli it wasn't nearly so sensible behind the scenes.
The hunky Twilight star, who plays Carlisle Cullen in the films, exclusively told Yahoo! omg! that he and Kellan Lutz (Emmett Cullen) got up to lots of mischief.
He said: "Kellan Lutz and myself were probably the biggest pranksters.
"[We did] lots of crank calls to people. We'd get bored sometimes so we'd do crank calls."
And Peter told us about an incident involving a certain Robert Pattinson.
He added: "I remember stealing Rob Pattinson's per dium [money allowance] once. It was was hanging out of his back pocket and we stole his envelope of cash."
How did the British movie star react to having his money nicked?
"He never got it back" [LAUGHS]
The American star also told us that he was very impressed with Kristen Stewart's transformation into a vampire for the final movie Twilight: Breaking Dawn Part 2.
He said: "I was very impressed with her performance in this movie. Bella's so awkward and clumsy, she's always played the damsel in distress and being rescued.
"In Breaking Dawn 2 she really comes into her own. She really gets empowered. It's almost like a coming of age story, coming into her own.
"When she transforms into a vampire she's completely different. She's this really strong character who ends up coming to save us."
And did the daddy of the Cullen family have any tips for the newbie?
"Lots of eye drops because the contact lenses get a little dodgy."
*WATCH OUR FULL INTERVIEW WITH PETER FACINELLI ABOVE*
Twilight: Breaking Dawn Part 2 is in cinemas November 16
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