An intimate documentary featuring never-before-seen images of one of the world's biggest stars is streaming now . Britney Spears is no stranger to the spotlight, having rose to fame in the noughties and claimed a spot among the greatest popstars of all time. Considering her stardom, it's difficult to find unseen images of the American singer at any point in her career. But the BBC has done just that in its new film, Britney: In Ten Pictures. The hour-long documentary is part of the broadcaster'