(yahoo) A woman named Mariah Yeater is claiming that Bieber is the father of her 3-month-old baby boy. Yeater filed legal paperwork demanding that Justin take a paternity test to "scientifically confirm" that he is the father, Radar Online reports, and that she's seeking "adequate support for my baby." It's about to get all Maury Povich up in here.

Yeater said in a signed affidavit that she met the singer backstage after Bieber's October 25th, 2010 concert at Los Angeles' Staples Center. A security guard allegedly saw Yeater in the crowd and asked if she'd like to meet Justin. "Immediately, it was obvious that we were mutually attracted to one another, and we began to kiss," Yeater told Star Magazine (via Radar), adding that he suggested they go somewhere private. That private place was a Staples Center bathroom. For the more scandalous, explicit details, check out Radar.

The Staples Center is a particularly romantic spot for the Bieb: He recently rented out the entire arena so he and girlfriend Selena Gomez could watch Titanic together. However, Bieber's reps were quick to respond to Yeater's allegations: "While we haven't yet seen the lawsuit, it's sad that someone would fabricate malicious, defamatory, and demonstrably false claims. We will vigorously pursue all available legal remedies to defend and protect Justin against these allegations." Yeater was 19 and Bieber at 16 at the time of the supposed bathroom rendezvous, so their brief fling avoids any statutory rape charges in the state of California, Gawker writes.

Bieber himself Tweeted about the allegations early this morning, saying: "all the rumors…the gossip…Im gonna focus on the positives….the music."

But let's keep things in perspective: Gossip rag Star Magazine first reported on the Bieber paternity claims, and the cover of their current issue says in big yellow letters, "Justin & Jen Married," referring to a Aniston/Theroux wedding that didn't happen. So, not the most trustworthy source, although their "Kim Moves Out!" story in last week's issue predicted the Kardashian separation. News of the Bieber scandal is spreading quickly, however: "Mariah Yeater" is currently a trending topic on Twitter. "Mariah Yeater, u're going down. bieber's lawyers will knock u down. beliebers will tear u apart and u will end up with ur baby in jail.")

Fathering a child at a young age isn't exactly a career killer — Lil Wayne's first baby arrived when the rapper was just 15 — but the tween market is insanely fickle when it comes to these things. The downfall of the Jonas Brothers could be traced back to when Joe Jonas started dating actress Ashley Greene (or was it Camilla Belle?), which broke the hearts of the millions of disillusioned fans who thought they actually had a chance with him. Something as benign as dumping Taylor Swift over the phone — which Joe Jonas also did — could be the difference between going gold and going platinum, so imagine the reaction of Bieber fans if they find out their idol sired a child in a concert-arena bathroom.