Justin Bieber Camp Denies Paternity Claim

California woman claims Bieber fathered her baby.

Justin Bieber is vigorously denying the claims made by a 20-year-old California woman who says in a lawsuit that the 17-year-old singer is the father of her newborn baby.

"While we haven't yet seen the lawsuit, it's sad that someone would fabricate malicious, defamatory and demonstrably false claims," Bieber's publicist said in a statement released on Tuesday. "We will vigorously pursue all available legal remedies to defend and protect Justin against these allegations."

Radar Online reports that Mariah Yeater claims she had unprotected sex with Bieber a year ago in a backstage area at one of the singer's concerts and that her three-month-old baby is his. According to an upcoming issue of Star magazine, "in a hand-signed affidavit, sworn under the penalty of perjury, Yeater told a California court that Bieber propositioned her on October 25 of last year, when she was 19. The pair had a sexual tryst after his concert and backstage at L.A.'s Staples Center, it's alleged in court papers."

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The affidavit requests that the court compel Bieber to undergo a paternity test to prove whether the child, named Tristan, is his and then to provide "reasonable child support, effective immediately."

Bieber, who confirmed in March that he was dating Disney star Selena Gomez, has discussed his opposition to casual sex in the past. He told Rolling Stone magazine in February that, "I don't think you should have sex with anyone unless you love them." According to Yeater, Bieber would have been 16 at the time of the alleged encounter. A court hearing is set for December.

The allegation comes at an awkward time for Bieber, who just released his first Christmas album, Under the Mistletoe, with a portion of the proceeds earmarked for a variety of charities aimed at education, youth well-being and music.