Keira Knightley
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Keira Knightley on 'End of World' romcom

5 July 2012 Last updated at 00:07 BST

Keira Knightley has praised the positive spirit of her character in her new film, Seeking a Friend for the End of the World.

Set in the near future, the film also stars Steve Carrell as an insurance salesman, fielding customers' phone calls as an asteroid hurtles towards the earth.

Knightley spoke to Talking Movies' Tom Brook about playing a modern woman and coping with stage fright.

Talking Movies is broadcast on BBC World News on Saturday at 13:30 GMT and is repeated on Sunday at 00:30, 07:30 and 20:30 GMT.