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As fall hemlines hit the floor, hair lengths are going up, up, up. Keira Knightley unveiled a sharp new bob recently at Paris Fashion Week but, true to her title, first lady Michelle Obama's been rocking the look for years

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Gwyneth Paltrow: Golden girl

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Elisabeth Moss: Retro glam

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Michelle Obama: First-rate

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Keira Knightley: Freshly shorn

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