Britney Spears said she has been a "caged animal" for "half" of her life during her latest Instagram spree. The 39-year-old musician shared a video clip of herself dancing and modeling a sheer cheetah-print jumpsuit – which was paired with a matching black bra and underwear set – as well as a shiny, green low-cut jumpsuit.The singer also shared that she was dancing to a song that hadn’t "been released" as a single.