By Caitlin Petreycik
Updated Jan 09, 2012 @ 10:33 am
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Credit: The Middleton Family; Chris Jackson/Getty Images

Happy birthday, Kate Middleton! The Duchess of Cambridge hits her milestone 30th today, and she certainly has a lot to celebrate. Take a moment to mark her big day by clicking through her transformation, and see her rise from teenage field hockey star to red carpet royal.