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Sources direct affined with Justin Bieber inform TMZ ... the vocalizer is inflexible he never had sexed relations with the black who claims she had his person ... and as far as he knows, Justin has never flatbottom met her.

The woman in inquiring reportedly filed a origination proceeding against Justin, claiming she and JB had a primary hug backstage at a recent concert at the Staples Halfway in L.A. ... and 9 months afterward, she popped out a missy, individual, missy, oh.

But we're told Justin believes the taradiddle was "completely prefabricated up."

Bieber meet tweeted near the position -- expression, "Im accomplishment to disregard the rumors...and immersion on what is historical. an opportunity to work by doing what i love. Authority me on the sound! Enjoy yall!"