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The drama in "Breaking Dawn Part 1" reaches its peak when Bella Swan gives bloody birth to her vampire-baby with Edward and Jacob taking turns trying to save her life, but don't think filming that key scene was some dour operation. In this exclusive DVD/Blu-ray blooper, Bella, Edward and Jacob -- better known as Kristen Stewart, Robert Pattinson and Taylor Lautner -- can't keep a straight face during even the most dramatic moments.

"It ended up working," Launter said about filming the scene -- which included Jacob giving Bella CPR -- "but it was funny in moments." Indeed! Watch the clip above and make sure to get your hands on the "Breaking Dawn Part 1" DVD/Blu-ray when it gets released on Feb. 11.