Will Arnett and Woody Harrelson have signed on to join Will Ferrell's Funny or Die Comedy Tour. According to The Hollywood Reporter, the sold-out tour will promote New Line Cinema's basketball comedy Semi-Pro.

Will Ferrell, Harrelson and Arnett star in Semi-Pro, and will join comedians Zach Galifianakis, Demetri Martin and Nick Swardson in the eight-venue tour, mostly heading towards college campuses. Will Ferrell's Funny or Die Comedy Tour is scheduled to play its final show at New York's Radio City Music Hall on Feb. 24.

New Line Cinema will release Semi-Pro in theaters on February 29th.

Semi-Pro was released February 29th, 2008 and stars Will Ferrell, Woody Harrelson, André Benjamin, Maura Tierney, Andrew Daly, Will Arnett, Andy Richter, David Koechner. The film is directed by Kent Alterman.