By InStyle Staff
Updated Apr 29, 2012 @ 11:00 am
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Yearbook Library; Globe

Can you guess who these birthday girls are by looking at their pre-fame shots? Uma Thurman (top) is celebrating her 42nd birthday today, while Michelle Pfeiffer turns 54. Congratulations, ladies! Click through our gallery to see Michelle's Hollywood transformation, from flaxen-haired teen to big screen siren.