Kate Middleton through the years

POSTED: 1:31 AM Jan 01 2012   UPDATED: 1:00 AM Jan 09 2015

With the Catherine, Duchess of Cambridge, otherwise known as Kate Middleton, celebrating her 33rd birthday on Friday, join us for a look at her through the years.

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Paul Hackett/WPA Pool/Getty Images

Before Kate Middleton married Prince William and became the Duchess of Cambridge, she was a commoner. Join us for a look at her through the years.

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