Watch FMovies. Jessie J’s music career isn’t the only thing that keeps soaring. The talented popstar showed off her impressive flexibility when she took to the stage to perform at the iTunes Festival at the Roundhouse in Camden, London. The singer entertained the crowd with her fierce dance moves as she moved about in a polka-dot sheer top, which exposed a black bralet underneath, nude stockings, high waisted pants and patent heeled boots.