Blake Lively is, in many ways, the ideal clotheshorse. With her sunny California demeanor, cascading blonde hair, and Barbie-esque figure, she's one of those mesmerizing girls who's willing to try any outfit and almost always makes it work. After she landed a starring role on the CW's Gossip Girl in 2007, she quickly became a fashion world darling, landing multiple Vogue covers and sitting next to Anna Wintour at runway shows. Designers clamored to dress her, and she later got contracts with Chanel and Gucci. Never afraid to show cleavage, leg, or both, she has a knack for making high fashion look youthful and sexy. Enjoy a look back at her plunging necklines, micro-minis, and floor-sweeping gowns in our slideshow.