Justin Bieber's team is fighting claims that he fathered a child.

Justin Bieber may not be able to brush off this “baby” after all.

The Los Angeles Police Department may look into the alleged backstage tryst with Bieber and Mariah Yeater, according to police commander.

While no report was taken in the Oct. 2010 incident, authorities can still decide to investigate further into the matter, Cmdr. Andrew Smith told The Associated Press.

Yeater, 20, filed a paternity suit against Bieber, 17, claiming that their backstage tryst at one of his L.A. concerts produced a child.

Yeater, who was 19 at the time, claimed that she had a sexual encounter with Bieber, who was 16 at the time.

According to California state law, “anyone who has unlawful sex with a minor and not more than three years older is guilty of a misdemeanor,” The Associated Press reported.

If convicted, the violation carries a one-year jail sentence.

In response to Yeater’s claims, Bieber’s team came swiftly to his defense, calling the suit “malicious,” “defamatory” and “demonstrably false.”

Bieber himself addressed the unwanted attention on Twitter Wednesday, saying he’s busy working on his new album and donating a portion of its proceeds to charity. “so Im going to ignore the rumors…and focus on what is real,” he wrote. “an opportunity to help by doing what i love. Judge me on the music! Love yall!”

Many of Bieber’s more than 14 million Twitter followers have bashed Yeater online; particularly passionate ones have posted death threats.

But now Yeater’s family is speaking out, urging Bieber to undergo a paternity test and provide Yeater with financial support if her young son is his, potentially making the lawsuit more than a blip on the “Baby” singer’s radar.

“I don’t know the whole story,” Eddie Markhouse, Yeater’s grandfather, told “Inside Edition,” “But, from what I understood, she met him at a concert and he sent two security guards down off of the stage to bring her backstage to meet him. She said they partied, had some drinks and they indulged in sex … She’s basically an honest good person. She’s got a big heart. She’s a good kid and she loves this baby.”