When Beatty cast Bening in 1991's Bugsy, the actor, now 75, knew his days as Hollywood's most eligible bachelor were numbered. "We just fell in love," Bening, 54, says of their courtship. "I knew something significant was happening." Now, the former playboy's social life revolves around his wife and their four kids. "He's a fantastic dad," says Bening. "He's just enthralled, very thoughtful, very communicative."