• BRITNEY Spears has terrified fans by dancing with knives in her latest Instagram video.
• The pop icon shared a bizarre video with her 42.1 million followers on Monday night in which she held a huge blade in each hand.
• Three dogs joined her in the video but ran away when she spun around with the bladesCredit: Instagram/Britney Spears
  The 41-year-old — who regularly dances in a bikini on the site — wore white bikini bottoms and a polka dot top as she used the kitchen knives to slice through the air.

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