Nick Cannon Naked But Not Afraid Of Mariah

Nick Cannon Naked Ice Bucket Challenge
Nick Cannon took the first public shot at his estranged wife Mariah Carey ... by putting his soon-to-be single body on display ... for the sake of charity of course.

TMZ broke the story ... the couple's divorce is a "done deal." Nick is clearly telegraphing ... he's taking the split in stride. 

Cannon accepted the ALS Ice Bucket Challenge from Spice Girl Mel B and upped the ante by completing the task in the BUFF! 

Nick also makes a point of talking about his wiener ... fond memories, Mariah?
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