Justin Bieber just can’t seem to get alleged baby mama Mariah Yeater out of his head. The teen singer now says he’s written a song about the San Diego woman who claimed Biebs fathered her baby in a back stage tryst.

The incident, which unfolded last November was the first stain cast on Bieber’s otherwise stellar career.

The woman claimed the sexual tryst occurred Oct. 25, 2010, which would put it around the same time as Bieber’s budding romance with Selena Gomez.

Yeater filed a legal affidavit, potentially setting herself up for a perjury charge, that she was invited backstage by bodyguards after Bieber’s performance at the L.A. Staples Centre.

Bieber vigorously denied the claim and the case fell out of the headlines after Yeater switched lawyers. Her current legal rep, Chicago lawyer and paternity expert Jeffrey Leving said he wanted to handle the matter privately.

Then, Bieber inexplicably wrote a bizarre Tweet, dredging up Yeater and the ugly incident again.

In the latest turn of events, Bieber says he wrote a song about her for his new album, which is the only reason his behavior might make sense.

He could be using the sordid incident to promote his album Believe.

“There’s a song about that girl that said she was gonna have my baby, Mariah Yeater,” Bieber said while promoting his album in London. “There are songs about things I’m going through. I wrote songs about different situations.”

Justin Bieber Stonewalling Paternity Case, Lawyer Says

Although Bieber’s camp said he took a paternity test to prove his innocence, Leving, in December, accused the pop star’s camp of stonewalling.

“Bieber’s counsel hasn’t told me where Bieber’s alleged DNA is secured, nor has provided information substantiating the chain of custody and protocol utilized in the claimed DNA collection and testing,” Leving said back then.

So does it all come down to cheap publicity?