"She's kind of the smallest one, but she suits being a vampire."- Rob gives bits of Kristen as a Vampire in BD

Pattinson confirms he and Stewart have filmed the birth scene, and with a laugh, says the shooting was "kind of hilarious."

He explains: "She has to have this pregnant suit on all the time, that was probably more annoying for her," he said. That's not the only change you'll see in Bella.

"I can't give too much away but there's some bits, especially towards the end of the movie, she's just like the polar opposite of any of the other (films)," he says. "I mean, she's a different person, which is cool. She looks completely different. She looks probably the most convincing vampire out of all of us."

Meaning what, exactly? "A lot of us look like we're just from Mars," said Pattinson. "She's kind of the smallest one, but she suits being a vampire."

Next up: Breaking Dawn's wedding shoot, scheduled for April. "That's a hard scene too," he told us. Not to mention the flood of paparazzi who will try to get a shot of Bella and Edward headed down the aisle. "It's been OK in Vancouver in terms of people showing up and trying to get stuff," says Rob. "I have a feeling the wedding is going to be the one with (paparazzi) parasailing in." Talk about a money shot.

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