Lizzy Caplan and Martin Starr Appear in the Lastest Edition of The Cat Whisperer Whitney Jefferson · 03/23/11 06:00PM You know I'm going to alert you all when there's a mini-Party Down reunion! Martin Starr and Lizzy Caplan star as white trash siblings. Martin reveals that he, too, is a cat whisperer and challenges Julie Klausner to a whisper-off.