If you'll pardon Keira Knightley for a minute, she needs a smoke. ''It's really rude to do this,'' she says in the middle of an interview on the rooftop of New York's posh Gramercy Park Hotel. ''Would you mind terribly if I just went and got my cigarettes and came straight back?''
With that, she's off for a few minutes to fetch some tobacco and papers. ''Are you smoking again?'' asks her Atonement costar James McAvoy as she returns and starts rolling her own.
''I'm smoking because there were so many f---ing photographers outside,'' she says. ''I thought, F--- it -- I'll have a cigarette.''
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