Kristen Stewart turns 23 tomorrow, and to celebrate the milestone, we're taking a look back at some of her best red-carpet looks (and sexiest fashion spreads) over the years. Kristen has become well-known for her succession of sexy ensembles, including high-slit dresses, sheer gowns, and microminis - and her covetable style even earned her the title of Red Carpet Queen of 2012 last year. From her sky-high Louboutins to down-to-earth Chuck Taylors, we've rounded up Kristen's most memorable looks - click through to see them all now.