Kreayshawn is upping her street cred ... by doing a duet on the street with the Naked Cowboy!


The 21-year-old rapper, who was nominated for Best New Artist this year at the VMAs, was recently in NYC -- where she spotted the nearly-nude singing cowboy and started an impromptu performance of her single "Gucci Gucci" with him.

Check out the exclusive video above!

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