Britain's Prince William and Catherine, Duchess of Cambridge talk with the Dean of Windsor, David Conner, after a service to mark Prince Philip's 90th birthday, in Windsor, west of London June 12, 2011.[Photo/Agencies]  

Britain's Prince William and Catherine, Duchess of Cambridge arrive at St. George抯 Chapel for a service to mark Prince Philip's 90th birthday, in Windsor, west of London June 12, 2011.[Photo/Agencies]