Amanda Seyfried makes dressing comfortably a high priority—but without sacrificing style and originality. "I love Stella McCartney and Alexander Wang," says the 24-year-old actress. "But I'm much more likely to buy leggings or drop-crotch sweatpants from them than an elaborate, low-cut piece. They both make casual clothes that have a little something extra going on—which is what I want." Read on for more of Seyfried's low-key, pretty picks.