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Robert Pattinson let sip a few choice details on Kristen Stewart and her on-set vampire change. The “Twilight” heartthrob said that Stewart changes the atmosphere on the entire set when she’s in vampire mode.

Speaking to MTV he joked “It's like she wanted to do it the entire time…It's really funny, it's like a completely different environment on set when she's a vampire and when she's not. I think she's going to do it really well.’

Peter Facinelli, who plays Pattinson’s on-screen father said “She's doing really well. She looks fantastic…For some reason, once they put those contact lenses in, [she looks] very statuesque.”

The Twilight Saga: Breaking Dawn - Part 1 is expected to open in cinemas on November 18.