In 1995 Martineau met Olivier Ducastel, and the two began a professional and personal relationship. Their first collaborative venture, "Jeanne et le Garçon formidable" (an &lt;a href="HIV/AIDS"&gt;HIV/AIDS&lt;/a&gt;-themed musical comedy inspired by the films of Jacques Demy and featuring Virginie Ledoyen and Demy's son Mathieu), was released in 1998. The film was entered into the 48th Berlin International Film Festival.