Mischa Barton: Style Setter

Peek at some of the O.C. star's most fashionable looks, selected by PEOPLE style expert Susan Kaufman. By Serena Kappes

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In this "floaty, layered" chiffon dress, Barton (at a FOX party in New York City in May) wears a "trend of the season," says Kaufman. Keeping her accessories to a minimum, she puts the focus on the "movement of the dress. When she walks, you'll see the flow. It's ethereal."