Vote! Natural vs. Hair Extensions

Presto, change-o – it's an instant makeover. Tell us what you think of the stars' lengthier looks – then see the results in PEOPLE's Fall StyleWatch issue, on newsstands Aug. 4. By Serena Kappes

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SAMAIRE ARMSTRONG

The Just My Luck actress transformed herself from a short-haired pixie on TV's The O.C. to a movie star with voluminous waves.