Keira Knightley has revealed she had to beg director John Maybury for a role in her new film "The Jacket" because he believed she was too innocent for the role, reports celebrity portal Ananova.

But she proved him wrong, said Maybury at a private screening of the film here. "She proved me wrong because she did a brilliant job."

"The Jacket", which is a psychological thriller about a Gulf War veteran, who foresees his own death, opens nationwide Friday. It also stars Adrien Brody and Daniel Craig.