Actress Jennifer Lawrence is every guys fantasy and every girls best friend. Her ability to exude sexiness, while keeping it cool is something that has made her one of America's most coveted actresses.

Lawrence was most recently honored with a Golden Globe nomination for her role in "Silver Linings Playbook" for "Best Actress" and her role in the epic trilogy "The Hunger Games" where she plays Katniss Everdeen has garnered critical acclaim.

Jennifer tops our list for a very different reason, her amazing transformational style. Over the year, we have seen her go from a beautiful, casual blonde to a sexy brunette overnight. The transformation has been astonishing to watch and we know 2013 holds only better things for this incredible actress.

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