Liv Tyler dreaded shooting romantic scenes with her The Hulk co-star Ed Norton - because she felt the actor's lean physique put her own to shame.

The Fight Club star toned up for his role as Bruce Banner, the mild-mannered scientist who transforms into the raging green monster.

And Tyler, who plays Banner's girlfriend Betty, was so intimidated by his svelte stature, she didn't want to be filmed standing next to him.

She says, "There were points when I was like, 'Wait! We cannot do this love scene because his body looks so much more beautiful than mine!'"