By Leah Ornstein - Radar Style & Beauty Editor
The newlywed, who was vacationing in the French Riviera with a group of pals, fearlessly stripped down into barely-there bikini bottoms and ran down the platform of the big boat, her bare boobs totally exposed as she plunged into the Mediterranean Sea.
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After her topless swim, Kate climbed back aboard the boat where she was met with a big blue towel to cover up.
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Just another day in the life of a supermodel!