Rosario Dawson pulled out all the stops for the L.A. premiere of her new flick Unstoppable this week. Walking the red carpet in a one-shoulder Stella McCartney gown with a thigh-high slit, it wasn’t her leggy look that caught our attention but rather her swept-away updo that warranted a double take. The actress pulled back her jet-black tresses in a loose chignon that boasted a dramatic side part. What we loved though was the dichotomy of the face framing waves on one side and the slick strands on the other. This is an easy hairstyle to achieve that relaxed yet pulled-together look for your big day.