Kristen Stewart "I'm so glad they didn't have to find somebody else; we already had him (Taylor Lautner )"

Kristen Stewart tells MTV News "I'm so glad they didn't have to find somebody else; we already had him!" "I didn't understand all the deliberation on [whether to bring him back]. But now that it's set, we can all rest."

Taylor Lautner, 16, was worried he wouldn't be rehired because his character, Jacob Black, is totally different in New Moon: Taylor Lautner's a foot taller and is supposed to look 25. So Lautner's packed on about 26 pounds of muscle.

Stewart says. "He's really buff!" "He definitely is. It took him a lot of time." "really excited" to shoot New Moon later this year.

"It's such a machine now. All of a sudden, this movie has become [something bigger]," she says. "With all the expectations — usually, you make a movie and think, 'If it touches people, great; if it doesn't, then you move on to the next one, and no one's personally affected by it.' [But] everyone's really sensitive with any changes right now.

"Everyone needs to be on the same page to make the same movie [as the original Twilight was]," she goes on. "Or else it will be a very disoriented project."

Kristen Stewart has faith in new director Chris Weitz. "Chris is — on top of him being a really sweet guy — he is entirely devoted," Stewart says. "And he's very clearly not doing the movie just because it's the next big thing. He really likes it a lot."