The world just wants Justin Bieber to grow up...or in this case, become the unwitting father of a fan. Again.

The 19-year-old "Baby" singer has been hit with another paternity claim, this time from a 25-year-old fan who alleges Bieber is the father of her baby.

The one-night-stand reportedly occurred after a concert in February 2010. The pair met at a TGI Friday's in Miami and subsequently had sex at his Gansevoort Hotel.

"She gave birth to a baby girl later that year, and Justin didn't know anything about it," says an unnamed source to Star Magazine.

"She just wanted to protect her baby. She wanted to keep her and her family away from any spotlight. In my opinion, she does look a lot like Justin did at the same age."

Bieber would've been 16 at the time of the alleged one-night-stand.

This is the second time Bieber has been accused of being the father of a fan's baby.

According to The Sun, in 2011, then 20-year-old Mariah Yeater said Bieber fathered her child after the pair allegedly had sex backstage after a concert.

"Immediately, it was obvious we were mutually attracted and we began to kiss," she claimed.

"I asked him to put on a condom for protection but he insisted he did not want to. He said because it was his first time he wanted to feel everything."

Yeater demanded "adequate support" for her four-month-old Tristyn in court, but the case was thrown out once Bieber agreed to submit a DNA test to prove he wasn't the father.

It seems the teenaged pop singer might have to endure another round of alleged fatherhood.

Bieber is currently being investigated for reckless driving after two calls were received on Monday by the Los Angeles County Sheriff's detectives, reports FOX News.