Star Style: Gwen Stefani

Peek at some of the trend-setting singer's most fashionable moments, selected by PEOPLE style expert Susan Kaufman. By Serena Kappes

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During a Grammy Awards performance in 2003, Stefani is sexy without being "over the top," says Kaufman. "Because she has that innocent sex appeal, she can get away with the thigh-high boots." And Stefani knows what works onstage and what doesn't, says Kaufman: "You'd never see her out on the street in this."