He may not admit that he is dating Kristen Stewart, but Twilight star Robert Pattinson has said that he has a "natural chemistry" with his co-star.

The 23-year-old actor, who is rumoured to be dating his co-star Stewart, says filming passionate scenes with her is easy, Ok! magazine reported online.

"There's a natural chemistry going on with Kristen," said Pattinson.

The British actor was worried that the chemistry would disappear in the film's sequel, 'New Moon', but things went smoothly.

"Even doing this sequel, it's so easy. I was really worried that I wouldn't know how to do it again, but it's so easy to play off her," he added.

Pattinson is planning to return to his home country once the shooting for the third sequel 'Eclipse' is done.

Director David Slade is filming the final few scenes for the film, due out next year, and will be sending the actors home this weekend.