Actress says she doesn't do it deliberately
Keira Knightley says she purses her lips when she's under pressure.
‘It’s when I’m nervous and my neck gets really, really tense and then that pressure sort of squeezes up to my lips and they push out,’ she says.
But The Edge Of Love actress, 23, doesn't think she does it much anymore.
'I think I was pouty when I was 16 or 17 when my first films came out,' she tells The Observer.
I don't know, maybe I still do it.'
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