The brown-colored Louis Vuitton leopard stole used to be all the rage — here's Kelly Osbourne sporting it a year ago — but now it's all about the bleu nuit version ($715). Sienna Miller, Liv Tyler, and Rachel Bilson have already been spotted around town with it. The pink adds a tinge of girliness, while the blue and gray keep things subdued cool. Sienna wore hers with jeans and a beanie, Liv tied hers over a black romper, while Rachel sported hers with a gray cardigan and white tee. The price is steep, yes, but it's a scarf that will keep you cool (and warm) for a long time.