For 12 years, Jane Birkin and Serge Gainsbourg shared a deep and fiery romance that has enthralled generations—but it wasn’t love at first sight. “She described him as this ghastly man who was arrogant and made her feel like a worm,” recalls Birkin’s older brother, Andrew, of their initial meeting on the film set of Slogan in 1968. “A few weeks later, though, I could tell things were aflame.” Andrew, who was then an avid photographer and a location scout for Stanley Kubrick’s unrealized film project Napoleon, often had a camera slung around his neck—and whenever possible, he trained it on the photogenic couple; their daughter, Charlotte; and Kate, Jane’s eldest child with the composer John Barry. Shooting mostly in black and white, he candidly captured them at home in Paris on the Rue de Verneuil, vacationing on the Isle of Wight in England, and among friends at the legendary nightclub owner Régine Zylberberg’s house in Deauville. “Andrew was very present on holidays but not omnipresent on private flings, thank God,” Birkin says. The intimate shots—which date through 1979, the year before Birkin and Gainsbourg broke up—have been compiled into Jane and Serge, A Family Album ($60, taschen.com). Among other things, the book reveals a comedic side to Gainsbourg that was rarely, if ever, seen in public. One of Andrew’s favorite photos is a portrait in profile of the bulbous-nosed singer with his bull terrier, Nana. “He said she made him look beautiful by comparison,” Andrew recalls with a chuckle.