A woman claims baby-faced singer Justin Bieber has fathered a child, it is reported.



The 20-year-old Californian woman has filed a lawsuit against the teen alleging he is the father of her three-month-old boy, Star magazine is reporting in its latest issue.



She was demanding the singer to take a paternity test "to scientifically confirm" he was the father of the child, according to court papers obtained by Star.



The papers were filed in late October and the woman asked the court for Bieber "to provide adequate support for my baby."



In an affadavit signed under penalty of perjury she said she was 19-years-old when she had sex with the then 16-year-old 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 reps 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."



The Canadian singer is dating 19-year-old actress Selena Gomez and the two have adopted a puppy from a shelter a couple of weeks ago.

But it seemed the teenager isn't as much a success with the dog as he is with this female fans.



"We just went to the shelter just to look around. Turns out, she brought one home. It was kind of like she just saw the dog, and it kept going to her.

"I don't think the dog really likes me that much," he said.