Two CBS pilots have added new cast members with Mary Lynn Rajskub joining How to Be a Gentleman and Michelle Trachtenberg signing on for an Untitled Peter Knight Project.

Mary Lynn Rajskub will play Janet on How to Be a Gentleman, the no-nonsense sister of David Hornsby's character, Alan. We reported earlier today that Kevin Dillon signed on to play Bert, who tries to teach Alan about how to live a better life. David Hornsby wrote the pilot script.

Michelle Trachtenberg is set to play Grace, the female lead on the Untitled Peter Knight Project. The program is a workplace comedy centering on the young workers at a venture capital firm. Grace turns some heads when she's promoted from the mailroom to a junior associate position. The promotion is devastating to Danny, who trained with Grace and also has a crush on her. Tim Peper has also joined the cast of this untitled project, playing the best friend of Danny. The Danny role has yet to be cast.

It isn't clear when these pilots will begin production.