It takes a truly fashion-devoted celeb to style up a look, even when she thinks no one is looking. That's the case with each of these street-smart girls, who've consistently caught our attention with their stylish looks — even when they're just ducking into the grocery store. Nicky Hilton proved she's got a serious eye for the on-trend, Whitney Port's got a flirty-fun aesthetic we love, and Jessica Alba showed us that, even with a kid in tow, she can pull off a killer look. Elle Macpherson earned a spot for delivering easy-chic, Kate Bosworth works a stylish angle wherever she goes, and Emma Roberts came into her own with a take on dressed-down cool that we love. Click through for the best street-styled celebs of the year, then cast your vote for the one who's always on her game.