Justin Bieber -- DNA Test Is In the Bag

Justin Bieber took a DNA test on Friday night in New Jersey, and now it's baby mama's move ... TMZ has learned.

We've learned ... Justin took the test at a lab under "very controlled circumstances."  We're told there is a solid chain of custody, so it's going to be hard for Mariah Yeater or her lawyer to challenge it.

As we first reported, Justin's team will NOT settle or even discuss settlement with Yeater or her lawyer.  It's now up to her to provide DNA results from Mariah's baby.

Justin has vowed to sue Mariah and her lawyers once he establishes he's not the daddy.

Mariah's lawyer was unavailable for comment.

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Justin Bieber -- Alleged Baby Mama ... RADIO SILENCE

The woman who claimed to be Justin Bieber's baby mama is running for the hills, because we've learned neither she nor her lawyer have made ANY attempt to contact Justin's team ... to compare his DNA with her baby's.

We broke the story ... Justin took a DNA  test in New Jersey last Friday, and sources connected with the singer say he's chomping at the bit ... waiting for Mariah Yeater to ante up her baby's DNA results.  But so far ... crickets.

Yeater's lawyer has been blabbing to the media, but has stayed clear of anyone in Justin's camp.  Sources connected with Justin believe Yeater will never produce DNA results, because it will simply become ammunition for a lawsuit he intends to file against her and her lawyers for abuse of legal process.

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