Joan Cusack has signed on to appear in all twelve episodes of Showtime's next original series "Shameless."
Cusack will be playing the role of Sheila, a Chicago housewife with a horny teenage daughter. She replaces Allison Janney, who left after filming the pilot episode to join the ABC comedy "Mr. Sunshine."
Cusack has a long list of feature film credits and two Oscar nominations for Best Supporting Actress. "Shameless," which is based on a British,drama is being produced by "The West Wing's" John Wells and series creator, Paul Abbott.