Pucker up, buttercup: "American Ultra" stars Kristen Stewart and Jesse Eisenberg are off to the makeout farm again. The duo were spotted smooching for the cameras on the set of Woody Allen's as-yet-untitled next film, shooting now in Los Angeles.

Eisenberg is a repeat Allen collaborator, previously starring in the filmmaker's "To Rome With Love." This is the third time Stewart and Eisenberg have co-starred together, following "Adventureland" and the recent "American Ultra."

Stewart is rocking some ultra-femme looks for the period piece, wearing a headband with the cutest little bow you've ever seen, as well as low heels with ankle socks.

Check out some pics of the duo puckering up below.

Ready...

...set...

...go!