Diane & Josh's Skinny-Dipping Confession

Diane Kruger had no problem revealing how she and long-time boyfriend Joshua Jackson cool off during the super-hot weather in a recent E! News interview -- though Jackson seemed pretty mortified!

Attending the Vogue and MAC Cosmetics dinner party celebrating designer Prabal Gurung, Kruger -- who showed off her flawless figure in a black crop top and Prabal Gurung floral-print pants -- revealed the pair's penchant for skinny-dipping.

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"Well I prefer to go naked," she said bluntly about how she beats the heat in the summertime. "But we have a pool, and actually our house is sort of in the middle of nowhere, so skinny-dipping is still an option."

"Shhhh!," Jackson quickly blurted out, before hitting his face with his hands.

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Check out the adorably awkward clip here!