Knightley, Wright clash over Atonement character

Keira Knightley and director Joe Wright almost came to blows before they began filming Atonement, because they couldn't agree over which character the actress should play.

Wright directs Knightley and James McAvoy as star-crossed lovers Cecilia Tallis and Robbie Turner in the upcoming big screen adaptation of Ian McEwan's novel, but the Oscar-nominated actress admits the filmmaker originally wanted her to play Tallis' younger sister Briony.