According to Zap2It, Tierney will play Robert California's wife.
"I'm a big fan of hers," 'Office' showrunner Paul Lieberstein told Zap2It. "I'm very excited."
So far she's only contracted for one episode, but maybe if we wish really hard she'll become a recurring character!
In other casting news ...
'Cougar Town' actor Dan Byrd is moving to 'Suburgatory' ... temporarily. Byrd will guest star as a new high school student in the show's 11th episode. [TVLine]
Brooke Davis is getting a dad!Richard Burgi will play the often mentioned and never seen father on 'One Tree Hill.' [TV Guide]
Allison Munn, Scott Holroyd and Devin McGee are returning to 'One Tree Hill.'Munn's Lauren will be paired with Holroyd's David. McGee's Xavier Daniels was last seen behind bars after attacking Brooke. [TVLine]
ESPN legend Brent Musburger will guest star as himself on 'Happy Endings.'Musburger and Damon Wayans Jr.'s character have a run-in in a bar. [TVLine]
More fall TV guest stars below!