"From the moment she burst on the scene with No Doubt, Stefani was setting her own trends," says Kaufman of the singer (left, in Louis Vuitton). Always sartorially adventurous, Stefani (whose solo debut album hits stores in November) "can carry something off that would look ridiculous on somebody else." The singer's own fashion line, L.A.M.B., showcases her love for fun streetwear.