It's boobs not bum for Keira

She is shy when it comes to her rear view. But Keira Knightley is apparently less inhibited about showing off her breasts.

The 19-year-old actress, who used a 'bottom double' for nude scenes in her movie Domino, appears topless in The Jacket, in which she plays a depressive who has a romance with a war veteran.

Asked why she was comfortable showing off her breasts but not her bottom, the Bend It Like Beckham star said: 'It's a girl thing. You know, it's just one of those things.'