In 1968, Serge Gainsbourg is chosen to star in Pierre Grimblat’s film Slogan for which the director also finds a lovely unknown British model, a certain Jane Birkin. When the two first meet, it’s a real fiasco, Serge Gainsbourg despises the young twig who has nothing in common with his previous lover, the sex symbol, Brigitte Bardot. Sensing their hostile relationship can turn his film into a disaster, Pierre Grimblat decides to bring together the two lonely individuals and organises a dinner at Maxim’s after which they both dance at the Regine nightclub: the trick works, Jane Birkin and Serge Gainsbourg fall madly in love. They rapidly incarnate the 1970s ultimate stylish and sulfurous couple that sings its emotional and physical love in scandalous songs and strikes the pose in irreverent photographies. The exquisite British doll with her flared jeans and straw baskets and the heavy smoker and drinker Pygmalion stage their romantic and sexy relationship, capturing the Zeitgeist of the liberated times they belong to. However, soon, Jane Birkin becomes tired of accompanying her partner in the same nightclubs every night and assisting to his alcoholic and aggressive decline and she difficultly takes the decision to leave in 1980 with her two daughters to move with a younger and more lighthearted man, Jacques Doillon. The separation is brutal but Serge Gainsbourg decides to transform his pain into a tender and moving affection: he becomes Lou Doillon’s godfather and offers Jane Birkin one of her most beautiful albums, Baby Alone in Babylone, in 1984. Their physical relationship had come to an end, Serge Gainsbourg settled with Bambou, Jane with other men but in the public’s mind, the ‘Gainsborough’ remains the musician’s official widow and she lovingly keeps him alive by singing his beautiful repertoire.