Bieber, a FATHER?

Justin Bieber fathered her baby in a backstage bathroom could be investigated for having sex with a minor because the singer was 16 at the time.

While no crime has been reported, Los Angeles police Cmdr. Andrew Smith told The Associated Press on Thursday that the department could investigate after Mariah Yeater filed the paternity suit against the teen heartthrob in San Diego Superior Court.

"If it's brought to our attention, of course we'll look into it," Smith said.

Yeater had just turned 19 when she says she and Bieber, then 16, had a brief sexual encounter after one of the singer's concerts at Staples Center. She said she gave birth to a boy in July and believes Bieber is the father because there were no other possible men she had sex with at that time.

She is asking a judge for child support and a paternity test. A hearing is scheduled for Dec. 15.