Since her breakout role as a sassy ballerina in Center Stage, Zoe Saldana has become one of the fashion world's favorite actresses. She's starred in a Calvin Klein underwear campaign, covered magazines like Elle and Glamour, and appeared in Vogue's "Best Dressed" issue this year. And it's easy to see what the fuss is about: She constantly experiments with color and silhouette on red carpets, showing up to the 2011 Met Gala in a lime-green Calvin Klein column dress, wearing voluminous purple ruffles to the 2010 Oscars, and trying sculpted brocade at Avatar's London premiere in 2009. Off duty, she sticks to skinny jeans, cotton T-shirts, and ballet flats. See her style through the years in our slideshow.