Article continues below advertisementBritney Spears knows how to keep Instagram buzzing.The 43-year-old pop icon surprised fans on Monday, August 18, when she dropped a video of herself casually cleaning while belting out Prince's "Kiss" in a daring look.Article continues below advertisementSpears showed off both her voice and her style in a brown polka-dot bralette with a plunging neckline, tiny white shorts and sleek black thigh-high boots.At one point, she ad-libbed, "I don't know who I am, oh, oh," while fiddling with a large light near her camera.