Duchess of Cambridge celebrates 30th birthday

The Duchess of Cambridge, seen here with her husband, Prince William, celebrates her 30th birthday on January 9, 2012. The royal couple attended the star-studded UK premiere of "War Horse" in London on Sunday, March 8.

The Duchess of Cambridge, seen here with her husband, Prince William, celebrates her 30th birthday on January 9, 2012. The royal couple attended the star-studded UK premiere of "War Horse" in London on Sunday, March 8.