Prince Philip, Duke of Edinburgh waves as he leaves King Edward VII Hospital in central London after being treated for a bladder infection, Saturday, June 9, 2012. The duke will celebrate his 91st birthday Sunday privately with members of the family. On Friday he enjoyed the company of grandsons the Duke of Cambridge and Prince Harry who paid a short, private visit to the hospital. (AP Photo/PA, Max Nash) UNITED KINGDOM OUT NO SALES NO ARCHIVE