By Caitlin Petreycik
Updated Sep 27, 2011 @ 10:40 am
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Gamma; Seth Poppel/Yearbook Library

Happy birthday, Gwyneth Paltrow! The leading lady turns 39 today, and in celebration, we're taking a look back at her transformation from brunet high school student to red carpet superstar. See Paltrow's evolution in the gallery!