U.S. comedy icons Carl Reiner, Tim Conway, Steve Lawrence and Garry Marshall are to guest star on an upcoming episode of "Two and a Half Men," CBS announced. The actors will appear on the Jan. 30 episode of the sitcom. "In the episode, multimillionaire Marty Pepper [played by Reiner] proposes to Evelyn [played by Holland Taylor]," a synopsis released Wednesday said. "In advance of their upcoming nuptials, Walden [played by Ashton Kutcher] and Alan [played by Jon Cryer] throw Marty a bachelor party. Marshall, Conway and Lawrence play Marty's friends who help him celebrate his last days of bachelorhood."