Mariah Yeater with the child she says Justin Bieber fathered.

It seems Justin Bieber‘s not the first man Mariah Yeater has named as the father of her child.

According to Frances Lippe, the grandmother of Yeater’s ex-boyfriend John Terranova, Yeater confronted Terranova last December claiming the baby was his. Lippe told TMZ.com that when Terranova denied that he fathered Yeater’s child, Yeater slapped him.

Court papers show that on Dec. 21, 2010, she was arrested on charges of misdemeanor battery. In June, the case was continued until Dec. 2011. She faces a trial next month that could result in as much as six months in jail and a $1,000 fine.

In an interview with “The Insider” airing tonight, Yeater, 20, says that Bieber, 17, got “aggressive” with her backstage at his Los Angeles concert last October. She claims they engaged in sex for 30 seconds and he refused to wear a condom.

Bieber’s team, which last week slammed Yeater’s paternity suit as “malicious” and “demonstrably false,” is now calling her actions “sad.”

“It’s sad that someone would fabricate malicious, defamatory, and demonstrably false claims,” Bieber’s publicist Matt Hiltzik said in a statement to ABCNews.com. “We’ll vigorously pursue all available legal remedies to protect Justin and to hold those involved with bringing this suit accountable for their actions.”

Yeater’s lawyers, Matt Pare and Lance Rogers, did not immediately respond to requests for comment. In an appearance on HLN’s “Dr. Drew” show last week, Pare and Rogers said they have “credible” evidence to suggest that Bieber’s the father of the child.

But there’s potential for the suit to backfire. Last week, the LAPD said officials may look into Yeater’s alleged tryst with Bieber as a case of unlawful sex with a minor since Bieber was 16 at the time and Yeater was 19. Such an offense carries a maximum one-year jail sentence.

Still, it appears Bieber is taking Yeater’s suit seriously. According to TMZ, the singer will submit to a paternity test when he returns from business in Europe. Bieber’s rep did not immediately respond to a request for comment on the report.