"Baby, baby, baby... noooooo!" That seems to be the response from the pop star's lawyers after rumors of Justin Bieber's baby-making spread like wildfire Wednesday.
In response, Bieber borrows a line from Shaggy -- "It wasn't me." His attorneys tell Star magazine that there's no way he was ever alone with anyone backstage at a concert.
But that kind of denial probably won't help the mop-haired heartthrob fight this allegation in court.
That's because in California, where the lawsuit was filed, courts use DNA testing as the primary way to legally determine a child's parentage when the parents are not married.
Once Bieber is served with the paternity suit, he will have 30 days to respond and to request a DNA test. If he doesn't respond to the suit within that time, the court has the power to go ahead and establish paternity as requested by Mariah Yeater -- even without genetic testing.
Of course, Bieber could also bypass the entire ordeal of court hearings and genetic testing by voluntarily signing a Declaration of Paternity form and filing it with the court.
His lawyers -- and his own tweets -- suggest that ain't gonna happen. So short of a shocking admission by Bieber, DNA testing may be the only way to determine for certain if Mariah Yeater, now 20, is telling the truth.
If Bieber is determined to be the 3-month-old child's father, he would then be on the hook for child support. He could also then file for custody of the child -- but since he and the child's mother are not married, courts usually award custody to mom if she is providing reasonable care.
Laws about establishing paternity vary from state to state. But only California law will decide if Justin Bieber fathered this child. His girlfriend Selena Gomez, for one, will likely be interested in the outcome of this case.