American designer Derek Lam launched his label in 2003 following a successful twelve years at Michael Kors, and he counts hip young stars like Natalie Portman and Rachel Bilson as fans. Lam's tailoring genius lies in his instinctive ability to cut sophisticated and wearable clothing. He says, "I always consider what will work for women at this moment, and to me this moment is about luxury without formality." Look out for his must-have silk cocktail mini dresses and zebra prints.