Robert Pattinson: Green Screen Stud

Continuing work on his new project, Robert Pattinson was on the set of "Water For Elephants" in Ventura County, California on Wednesday (July 7).

The "Twilight" heartthrob busily plugged away in front of a green screen on the top of a "moving" train while joined by co-star Christoph Waltz.

The work duties come after Robert recently joined his "Eclipse" co-star girlfriend Kristen Stewart to surprise fans at the Century City IMAX theater.

"We just wanted to come and say thank you in person for making this such a great weekend," Miss Stewart is quoted as saying.

Meanwhile, Robert added: "I hope you liked the movie, because otherwise this would be really embarrassing."

Enjoy the pictures of Robert Pattinson working on "Water for Elephants" (July 7).