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Justin Bieber has made good on his promise to take a DNA test to prove that he’s not the father of Mariah Yeater‘s 4-month old son, as she has claimed in a lawsuit against the pop star.

TMZ reports that Bieber took the DNA test on Friday at a laboratory in New Jersey, and that there’s been a tight watch on who’s been handling the test to avoid any possible arguments from Yeater’s team as to the validity of the results. There’s no word as to when the results might be released.

From the beginning, Bieber has insisted that he is not the father of Yeater’s baby, and has made several public statements stating his case. During an interview on Today, Bieber took a stand, saying to Matt Lauer: “I’d just like to say basically that none of those allegations are true … I know I’m going to be a target, but I’m never going to be a victim.”

Although every effort to present himself as a "chaste and good girl," and this describes the media and her family, 20-year-old Mariah Yeater, who claims that her child did Justin Bieber, no stranger to the publication of nude photographs.

As quoted by U.S. media, Mariah has a MySpace profile under the name Mariah Laci, and which announced its many photographs, including several nude. On the photo is obvious that the tattoo and piercing lover.

Yeater said that the son was born "exactly 36 weeks and two days after having sex with Justin Bieber". He says that during this period had no relationship with none other and is sure that the child Biebe's. Bieber denies he is the father.