Albert II (Albert Alexandre Louis Pierre Grimaldi; born 14 March 1958) is the reigning monarch of the Principality of Monaco, and head of the Princely House of Grimaldi. He is the son of Rainier III, Prince of Monaco, and the American actress Grace Kelly. His sisters are Caroline, Princess of Hanover and Princess Stéphanie. In July 2011, Prince Albert married Charlene Wittstock.