The Insider.com

To wet your appetite for The Twilight Saga: Breaking Dawn - Part 1 coming to DVD next weekend, check out these hilarious bloopers of Robert Pattinson, Taylor Lautner and Kristen Stewart cracking up while shooting the film's infamous birthing scene.

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Hey -- you try keeping a straight face while trying to eat a half-vampire baby out of its womb!

Robert Pattinson on 'Breaking Dawn' Sex Scenes

Click the video to see Pattinson get a serious case of the giggles, Lautner's predictably articulate way of describing the scene, and rare smile from Kristen Stewart (yes, it exists!).

Are the 'Twilight' Kids Actually Movie Stars?

The Twilight Saga: Breaking Dawn - Part 1 comes to DVD, Blu-ray and iTunes February 11.