Kristen Stewart's character in The Twilight Saga movies, Bella Swan, is to become a vampire, and the actress is already scaring people on set.
Breaking Dawn is the final instalment of the supernatural films, and will see Bella get her wish to become a blood sucker.
Stewart is rumoured to be loving the new dimension to her character, and apparently makes such a convincing vampire that she has been frightening her co-stars.
Elizabeth Reaser, who plays Esme Cullen, has found filming with Stewart unnerving. The actress said: "She scared me a little bit. I'll be honest with you."
Stewart's boyfriend and co-star, Robert Pattinson, seemed excited by her new role: "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."
Breaking Dawn is set to be released in two parts, with the first film due later this year on November 18.
Fans will have to wait a whole year for the second movie, as it is not expected until November 16, 2012.