
Pattinson and the rest of the cast stopped by the Ellen DeGeneres Show -- where Rob tried to dispel the rumor that the scene was re-shot due to Kristen Stewart's over-zealous, uh, participation.

So how exactly do those magic movie editors remove a butt crack? "They just painted over it ... you’re allowed to show cheek," Rob explains. "You can’t show crack."
The full interview is set to air on Nov. 18.