Duchess Kate & Prince William: Wimbledon Championships!

Catherine, Duchess of Cambridge and Prince William attend day nine of the Wimbledon Lawn Tennis Championships held at the All England Lawn Tennis and Croquet Club on Wednesday (July 4) in London, England.

The couple applauded from their seats in the Royal Box on Centre Court as they watched Roger Federer take on Mikhail Youzhny in the quarterfinals.

PHOTOS: Check out the latest pics of Duchess Kate

Federer defeated Youzhny 3-0 and will now face Novak Djokovic in the semifinals.

20+ pictures inside of Prince William and Duchess Kate at the Wimbledon Championships…