Kristen S

"An experience to treasure": The fourth installment of the blockbuster film franchise, in theaters Friday, chronicles the lavish forest wedding, island honeymoon and impending parenthood of mortal teenager Bella Swan (Stewart) and her brooding vampire crush, Edward Cullen, played by Stewart's real-life squeeze, Pattinson. While shooting the nuptials, Pattinson said he was made painfully aware "just how irrelevant the groom is in a wedding. You just kind of stand there." But for Stewart, the shoot could not have been more touching. "It was just what I was hoping for," said a J-Mendel clad Stewart. "I wanted to remember it as an experience to treasure without any neurotic actory weirdness.

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In labor: During the packed premiere screening, the fans' thunderous applause for the "I do" exchange was eclipsed only by the deafening cheers for the long-awaited consummation scene. Director Bill Condon recalled Kristen being "as nervous as Bella would be, but Rob had her back the whole time. They're so protective of each other." One warning: the climactic (and truly gruesome!) birthing scene is not for the faint of heart. "It's difficult to get more surreal than chewing through a placenta," cautioned Pattinson, while Stewart is still uneasy about "looking down and seeing my head sticking out of a fake pregnant body."

Part 2 (Spoiler alert!): Be sure to stay in your seats after the closing credits begin to roll for a glimpse of the treachery ahead when Twilight's concluding chapter hits theaters in November 2012. Mackenzie Foy, 11, appears for only a glimpse at the end of Part 1 as Bella and Edward's daughter, Renesmee, but says, "I do a lot more in the next one." Such as? Taking a ride on the back of Jacob (Lautner) in werewolf form. Reaser's favorite scene finds her and movie husband Facinelli heading to Egypt "to recruit vampires in this Egyptian palace." Lutz, meanwhile, can't wait for fans to see his arm-wrestling scene with Bella, a newly christened vampire. "It's kind of ridiculous that she beats me," said Lutz, "but she does!" And according to Lautner, Bella also gets rough with his Jacob. "There's a scene in Part 2 where Bella finds out I imprinted (summoning a protective spell) on her daughter, and she throws me around the backyard. It was so funny for me to see Kristen doing that."