Number 47 - Katherine Heigl

We're not sure about the morals of the men who first cast a 16-year-old Heigl as the jailbait young daughter in My Father The Hero or Under Siege 2, but there was no mistaking even back then that the wide-eyed blonde was a looker. To be fair, she'd known this since she was nine, ever since some aunt of hers sent some snaps to a bunch of model agencies.

A part-time queen of chick flicks (27 Dresses, Knocked Up), it's a bit of a surprise that she's been described as having a strong feminist streak. Whatever, she's certainly been taken more seriously after landing the role of sexy Izzie Stevens in TV medical drama Gray's Anatomy, a part which landed her an Emmy.