The present study examined how adolescents' and their romantic partners' romantic working models and relational styles were related to their interactions with each other. Sixty-five couples (M age=18.1 years) were observed interacting. Romantic working models were assessed in interviews about their romantic experiences; romantic styles were assessed by self-report. Data were analyzed using the Actor Partner Interdependence Model. Working models of romantic relationships, especially girls' models, were predictive of their behavior, the partners' behavior, and the dyads' behavior. Fewer links were found between relational styles and observed behavior. The present study extends past work by showing that representations of romantic relationships influence or are influenced by romantic interactions, even as these representations and relationships are just developing.