Hold up… wait! Justin Bieber is barely outta puberty but word on the curb is that he’s already a baby daddy!

A lawsuit has been filed against the popular teen sensation, by a 20 year old woman who claims she had sex with the under aged star backstage during a concert in LA last year.

She is claiming their encounter resulted in the birth of her now 3 month old son and she’s seeking a paternity test as well as support for her child.

[Somebody dial up Maury Povich on Line 3…]

Details below…

According to RadarOnline:

A 20-year-old California woman has filed a bombshell lawsuit against teen pop icon Justin Bieber alleging he is the father of her three-month-old baby boy, Star magazine is exclusively reporting in its new issue.

Mariah Yeater is demanding the singer take a paternity test “to scientifically confirm” he is the father of the child, according to court papers obtained by Star.

The papers were filed in late October and Yeater asks the court for Bieber “to provide adequate support for my baby.”

In an affadavit signed under penalty of perjury Yeater says she was 19 years old when she had sex with the underage star backstage at one of his concerts in Los Angeles.

Bieber’s reps have strenuously denied the accusations but a court hearing has been set for later this year. In a statement to RadarOnline.com, Bieber’s said: “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.”

Story developing…

Stranger things have happened.

Could Justin be the father? Hmmmmm… ?? I guess we’ll just have to wait and see.

In the meantime, maybe Justin can hit up Shawty Putt & Lil Jon and do a hot remix of Dat Baby…

VIDEO: Dat Baby ~ Shawty Putt