Singer-actress Miley Cyrus is to guest star in a pair of episodes of the U.S. sitcom "Two and a Half Men" this fall, CBS said. She will play Missi, an old family friend of Walden's who comes to visit for a week and develops a relationship with Jake when he comes home from the Army, the network said in a news release Monday. Ashton Kutcher plays Walden and Angus T. Jones plays Jake. Cyrus starred in the Disney Channel series "Hannah Montana." She also headlined the feature films "Hannah Montana: The Movie," "The Last Song" and "Bolt."