Happy Birthday, Sienna Miller! See Her Most Memorable Beauty Moments

Sienna Miller is one cool chick. She can easily sport a runway-worthy gown with a messy bun because that's her style. Sienna isn't one for very dramatic updos or over-the-top makeup. She's fine with just a tube of red lipstick on hand. But every once in a while, she pulls out all the stops to show off her glamorous side. See Sienna in everything from ponytails to top hats in this style retrospective honoring her birthday.