Rita Ora flashes her flat stomach in leather bra and black pants as she writhes around on the floor in racy Instagram video

Rita Ora was in a more lighthearted mood on Monday, sharing a sexy video of herself writhing around on the floor for the amusement of her Instagram followers.

The 24-year-old singer was channeling her inner Britney Spears in what appeared to be a racy photoshoot, mimicking the pop princess' pose from her iconic debut Rolling Stone magazine cover. Photos after the cut...