Allison Janney Books 'The Big C,' Henry Winkler Comes To 'Up All Night' And More Casting News

Allison Janney is stopping by "The Big C." The "West Wing" veteran will guest star in Season 3 of the Showtime series starring Laura Linney as a woman with cancer.

According to Showtime, Janney will play a Hollywood producer who wants to purchase Cathy (Linney) and Paul's (Oliver Platt) life rights to use in a film.

The third season of "The Big C" kicks of on Sun., April 8, 9:30 p.m. EST on Showtime. Other Season 3 guest stars include Susan Sarandon and Victor Garber. Janney recently booked a role in the NBC pilot "Friday Night Dinner."

In other casting news ...

"One Tree Hill" star Sophia Bush will star in a new CBS comedy.
The comedy follows two good friends -- Louis, a gay man and Charlie, a straight man. Bush will star as Charlie's girlfriend. [TVLine]

Henry Winkler is coming to "Up All Night." The "Happy Days" veteran will play Ava's (Maya Rudolph) father. [THR]

Daniela Bobadilla will play Charlie Sheen's daughter on "Anger Management."
Bobadilla will co-star opposite Shawnee Smith and Selma Blair in the FX comedy. [EW]

"Lost" actors Jeff Fahey and Kevin Tighe will guest star on USA Network's "Common Law." Fahey will play a booze-loving detective and Tighe will play a missing persons detective in the new buddy cop series. [EW]

Zach McGowan is getting a "Shameless" promotion. McGowan will be a series regular on the Showtime series for its third season set to begin production this summer. [THR]