8. Rachel Bilson

Former OC star, Rachel Bilson is in here mainly because of her cool, chic casual style. Rachel works the laid back Californian style like no other, from sweet looking blouses and polka dot dresses to denim, she always manages to look put-together and stylish. On the red carpet, Rachel has a distinct style - no-fuss dresses with minimum accessories works best for her. In 2010, the two-tone hair seemed very popular, what with Hilary Swank and Jessica Biel joining in too, but no one did it quite like Rachel. All in all, a trendsetter and a very fashionable female of 2010.