Bradley Whitford to guest star in the fourth season of the Mom TV series on CBS. (Photo: Helga Esteb / Shutterstock.com)

Cross your fingers for a walk and talk scene. The West Wing‘s Bradley Whitford is guest starring in the fourth season of former co-star Allison Janney’s Mom TV show on CBS. Season four kicks off October 27th at 9:00pm. To get in the mood, watch Whitford as Josh Lyman and Janney as CJ Cregg, in an old walk and talk clip, after the jump.

Whitford’s episode of Mom is slated for January. He will play a friend of Adam (William Fitchner). Adam is Bonnie’s (Janney) boyfriend on the sitcom. EW says, “A former stuntman who is now a Hollywood director, Whitford’s character is also quite the imbiber – which impresses Bonnie and Christy (Anna Faris).” MadTV‘s Nicole Sullivan is also guest starring as Adam’s friend, Leanne.

Do you remember the longest West Wing walk and talk? Check it out.

What do you think? Are you a West Wing fan? Will you tune in for the fourth season of Janney’s Mom TV series, to catch her reunion with Whitford?