Britain's Queen Elizabeth smiles as she leaves St Paul's Cathedral after a thanksgiving service to mark her Diamond Jubilee in central London June 5, 2012. Four days of nationwide celebrations during which millions of people have turned out to mark Queen Elizabeth's Diamond Jubilee conclude on Tuesday with a church service and carriage procession through central London. REUTERS/Andrew Winning (BRITAIN - Tags: ROYALS ENTERTAINMENT SOCIETY ANNIVERSARY TPX IMAGES OF THE DAY)