Ever since she first set foot on a red carpet in 2006, Emma Stone has always looked like she's having a ball in front of the cameras. Now 23, she has established herself as an adventurous dresser, always wearing something bold yet uncomplicated. She credits much of her sartorial success to her stylist, Petra Flannery, who has helped establish Stone as a mature, estimable celebrity (and distance her from her more notorious peers), one crystal-flowered Lanvin gown at a time. Here's a look back at her best style moments, both on and off the red carpet, from her color-blocked Giambattista Valli peplum dress at a Friends With Benefits premiere last year to her floor-length black Chanel number at the Vanity Fair Oscars party this spring. Enjoy!