20 of 65:
Kate Middleton turns 31 on January 9, 2013. The Duchess of Cambride and wife of Prince William is currently pregnant with their first child -- the potential future heir of the British throne.
(Pictured: Britain's Prince William, right, and Kate, Duchess of Cambridge watch Roger Federer of Switzerland play Mikhail Youzhny of Russia during a quarterfinals match at the All England Lawn Tennis Championships at Wimbledon, England on July 4, 2012.)
(AP Photo / Anja Niedringhaus)