Princess Charlene of Monaco and Prince Albert II of Monaco embrace during celebrations marking Prince Albert II's decade on the throne, Saturday, June 11, 2015 at Monaco's palace. On 31 March 2005, the Palace of Monaco announced that Hereditary Prince Albert would take over the duties of his father as regent since Rainier was no longer able to exercise his functions as sovereign. On 6 April 2005, Prince Rainier III died and Hereditary Prince Albert became Albert II, Sovereign Prince of Monaco. REUTERS/Olivier Anrigo/Pool