55. Megan Fox
Megan stayed busy over the Summer with Transformers 2 before branching out to take on a leading-lady role in Jennifer's Body. She tackled more substantive work by filming Jonah Hex with Josh Brolin and Passion Play with Mickey Rourke. Off screen, Megan's main man is her longterm boyfriend, Brian Austin Green — she even says she feels like a stepmother to his son, Kassius. Megan's natural good looks earned her a spot on our list of 2009's sexiest women, and she even replaced Victoria Beckham as the body of Armani underwear.