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Britney gone wild, y'all! Brit seemed to be celebrating something this afternoon with a very cold dip in Malibu waters with her pal Lucy Walsh. After spending more than two hours talking and signing papers at the Bel Air Bar & Grill with some suits (more on that later ...), she drove to the beach, stripped down to her skivvies, and ran quickly in to and out of the freezing water.

XCLUSIVE video coming tomorrow!

more pix inside ...