Taylor Lautner Struggled with Robert Pattinson Fight Scenes

But Lautner found it difficult to act angry at his pal - and they couldn't get through the scenes without giggling.

He tells Access Hollywood, "One of the most challenging things about filming this was having to hate Edward, because I’m looking at Rob and it was difficult. Every time we’d have a shouting match or he’d grab me on the shoulder or something, as soon as they called cut, we’d bust out laughing. Or we’d ruin plenty of takes.”