Justin Bieber was Mariah Yeater's second-choice baby daddy?

When Mariah Yeater accused Justin Bieber of being the father of her baby, she said he was the only one who could've done the deed. But what about the former boyfriend she allegedly identified as the baby daddy back in December?

Ouch, Justin — second choice. That's gotta sting.

Former boyfriend John Terranova, 18, heard from Yeater in December that she was pregnant and he was the father, Terranova's grandmother Frances Lippe told TMZ. Long story short: That who's-the-daddy visit led to an alleged argument, capped by an alleged window-breaking by Yeater, followed by an alleged return by Yeater to discuss paying for said window, finally wrapped up with Yeater's arrest on suspicion of domestic violence after police were called to sort out the second argument that broke out, which allegedly included Yeater slapping her ex repeatedly. (She's due in court Dec. 12 to deal with that charge.)

Lippe said they didn't hear from Yeater after that. Allegedly.

Bieber, meanwhile, said Friday that he'd never heard of Yeater at all before she filed her paternity suit. "Never met the woman," he told the "Today" show gang while a mass of young female fans screamed in the background.

"None of those allegations are true," the pop star said in his newly lower voice. "I know that I'm going to be a target, but I'm never going to be a victim."

(If that last line came from his just-hired crisis-management team, they may have already earned their keep.)

The Biebs said he goes from the stage to his car after every show, calling it "crazy that some people want to make up such false allegations.

"To set the record straight, none of it is true."

Yeater said in her lawsuit that she and Bieber met at a concert in L.A., were immediately attracted to one another and then went backstage so they could be alone. He then allegedly talked dirty to her and left her with child after 30 seconds of sexual intercourse that was had while she was lying on some sort of bathroom shelf.

And, she said, he never followed through on his promise to give her his number, instead saying he'd remember hers. And he never returned her calls to his people.

One of Yeater's attorneys, Matt Pare, said on HLN's "Dr. Drew" program Thursday that they have "credible evidence" the baby is Bieber's — but it's evidence they haven't shared with the media, because paternity cases are "technically confidential." The paternity suit was filed Monday in San Diego and was confidential except for the part where Star magazine told the world about it immediately.

Also noted by Team Yeater: Despite the age difference — she's 20 now, he's 17, and a year ago they were, well, each a year younger — she would "not technically" need to worry about statutory rape charges, because in this case it would only be a misdemeanor, and a $5,000 fine would be worth it if she got the child support she's seeking.

Bieber was on "Today" to promote his "Under the Mistletoe" Christmas album, profits from which will go to various charitable organizations, including a Canadian food bank that helped his family when they were struggling.

In addition to clarifying he was no baby's daddy, he shared the fact that it was really hard to record a Christmas record in September.