no life without chemistry

Justin Bieber will reportedly submit to a paternity test upon his return from Europe — and if it proves he's not Mariah Yeater's baby daddy, she might be on the receiving end of a lawsuit courtesy of the Biebs.

Her lawyers, meanwhile, said they are encouraged to be getting what they asked for, because in their view having the 17-year-old pop star submit to DNA testing is the only way to figure out who fathered their client's 3-month-old child.

"We are encouraged that Justin Bieber will voluntarily take the paternity test," attorneys Lance Rogers and Matt Pare told TMZ, adding that the child-support lawsuit was filed "in good faith" and isn't going away any time soon. TMZ broke the news that Bieber would do the DNA test.

Yeater filed a lawsuit in San Diego on Halloween, alleging that she and Bieber had had brief, virginity-stealing sexual intercourse (his virginity, not hers) in a bathroom backstage after his Oct. 25 show in L.A., after which he wouldn't give her his phone number.

The 20-year-old will be going even more public with baby boy Tristyn and her version of her 30 seconds with Bieber in an interview with "The Insider" set to air Monday night. E! Online quotes her as saying their encounter "went from cute and gushy, you know, to just more aggressive."

Bieber said Friday on "Today" that he'd "never met the woman." Yeater reportedly told ex-boyfriend John Terranova last December that she was preggers and that he — Terranova — was the father.

Terranova, who'd dated Yeater for four years, told the Sunday Mirror that his ex "came back here from California telling me she was pregnant with my child. I said, 'This is impossible, you've been in California two months and back here for only a week.' She told me, 'No, I got pregnant before I left.' But it didn't make sense because she had a doctor’s note saying she wasn't pregnant enough for that to be possible."

Yeater's visit to Terranova's place in Las Vegas ended in her arrest on suspicion of domestic battery, for which she headed to court in Clark County, Nevada, on Dec. 12.

Unnamed friends, meanwhile, told the Mirror that Yeater also had mentioned a "secret boyfriend" named Steve as the baby's father.

"It's disappointing that people would stoop so low," a source told People, regarding the likelihood of a lawsuit from Team Bieber, "but somebody needs to stand up to them." A Bieber attorney said last week that they would "vigorously pursue all available legal remedies to defend and protect Justin against these allegations."

Bieber is currently in Europe, in part for the MTV Europe Music Awards on Sunday night in Belfast, Northern Ireland, where he performed live and took home awards for best male and best pop act.

Also, ladies, for the record: The Biebs' girlfriend, Selena Gomez, performed at the show as well.