The Socialist Party (, PS) is a social-democratic French-speaking political party in Belgium. As of the 2010 elections, it is the second largest party in the Belgian Chamber of Representatives and the largest Francophone party. The party is led by Paul Magnette, the successor of Elio Di Rupo, who became Prime Minister of Belgium as of 6 December 2011. The party also supplies the Minister-Presidents of the Walloon region and  French Community (Rudy Demotte), the Brussels-Capital Region (Charles Picqué) and the German-speaking Community (Karl-Heinz Lambertz) of Belgium. In the German-speaking community, the party is known as the Sozialistische Partei (SP).