LimeLife: Okay Julia Jones, if we could ask you anything about one of your co-stars, it would be this: Does Robert Pattinson speak with an American or a British accent between takes?
Julia Jones: (laughs) Yes, Rob is British, he has a British accent, and he speaks like that when he's not acting! His [American] accent is so good, actually. Sometimes hearing him speak in his normal British accent, I get a little thrown off, because his American accent is just perfect.
LimeLife: Can you tell us whether he is actually a pleasure to work with?
Julia Jones: Oh, he's an absolute pleasure to work with. He's great. He's thoughtful and he's generous and he's laid-back. He's got all the qualities that you'd look for in somebody you'd be working with.
Read the rest of her interview at the source
Via Twilight Source