Lizzy Caplan says she's NOT the one holding up a possible "Party Down" comeback ... telling TMZ she's ready, willing and able to bring back the catering show ... as soon as someone calls her. Caplan -- who played Casey Klein on the Starz show -- was at Fig and Olive in L.A. Thursday night when we…

"Bachelorette" babes Lizzy Caplan, Kirsten Dunst and Isla Fisher made nice at the film's premiere in Hollywood the other day. Question is ... More Who'd You Rather?Eva Amurri vs. Jaime King vs. Mandy MooreJoey Capponi vs. Louis VerdiJoel McHale vs. Ben Affleck