Justin Bieber took a DNA test on Friday night in New Jersey under very controlled circumstances to prove that he is not the father of 20-year-old Mariah Yeater's baby, TMZ reports.

The Canadian pop star has been on the defense ever since Yeater said he was the father of her baby, Tristyn Anthony Markhouse Yeater, earlier this month.

Yeater claimed to have credible evidence and was pursuing a modest and rightful claim from the 17-year-old star before she quietly dropped the case last week after incriminating evidence surfaced.

An unidentified friend of Yeater's provided Bieber's lawyer and TMZ with text messages from Yeater that strongly suggest the 20-year-old single mother fabricated her claims.

Pleease ERASE ALL MESSAGES from my mom where she says Tristyn is Robbie's son, one message read. Ill kick u when we get paid..Im trusting you please [sic].

The message was reportedly sent on Nov. 16.

Yeater's former boyfriend also accused his ex of lying about the alleged tryst with Bieber, claiming she initially said the child belonged to him.

Yeater filed her lawsuit on Oct. 31, stating that Bieber's bodyguards invited her backstage after a Los Angeles performance. He's said to have told the fan that it was his first time before quickly removing his clothes. Yeater claims that the liaison lasted about 30 seconds in a backstage bathroom.

Yeater stated in court papers obtained by Star magazine that she got food stamps and welfare totaling about $500 per month and had just $400 in the bank. She claimed to owe the hospital where she gave birth $25,000.

In the court papers, she recounted a salacious blow-by-blow of how her son was conceived, maintaining that she contacted Bieber's representatives after getting pregnant, but received no response.

The Bieber baby rumors marked the first major scandal the star has faced in his young career. A devout Christian who's spoken out against casual intercourse in the past, Bieber went into overdrive to protect his wholesome reputation, vowing to take a DNA test as soon as he got back to the U.S.

Bieber's spokesmen said from the start they would pursue all available legal remedies to protect him against the allegations, calling them fabricated, defamatory, and malicious.

Last Wednesday, TMZ reported that Yeater dropped her paternity suit against Bieber, and that Yeater's lawyers, Lance Rogers and Matt Pare, had abandoned the case.

On Thursday, the single mother's new lawyer, Jeffery Leving, told the celebrity gossip outfit that she simply dismissed the case to allow for a private settlement.

Bieber's lawyer Howard Weitzman was adamant there will be no settlement, insisting, There have been no settlement discussions and there never will be.

Bieber plans to take legal action against Yeater over her story, though Leving claims the threat is an attempt to intimidate a 20-year-old woman with no money and no job.

Now that Bieber's DNA test is in the bag, he plans to pursue legal action as soon as it's established that he is not the baby's daddy.