Article continues below advertisementBritney Spears is determined to dance till the world ends - even if her clothes fall off in the process.The pop star, 44, suffered a nip slip as she whipped her long blonde hair and spun in circles on Sunday, January 4.In the erratic Instagram clip, Spears donned a plunging, sheer frock with a brown bikini underneath it.Article continues below advertisementSource: @britneyspears/InstagramBritney Spears danced wildly and whipped her hair.At one point, the triangle-shaped top exposed her b----, and the singer covered her nipple with a pink flower emoji.