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Mariah Yeager

Courtesy of THE INSIDER

Guess who's ready for his closeup?

The 20-year-old woman claiming to be Justin Bieber's baby mama is doubling down on her allegations—and showing off their purported love child on national TV.

So what do you think, Beliebers? Does 3-month old Trystan bear any resemblance to the 17-year-old teen sensation?

After sparking a media firestorm last week via a paternity suit claiming Bieber fathered a child with her—accusations which prompted vehement denials from Bieber—Mariah Yeater has now given her first TV interview on the matter and isn't backing off her claims.

In a sit-down with The Insider airing tonight, Yeater outlines what she claimed was an October 2010 post-concert liason with Bieber at Los Angeles' Staples Center. She claims a security guard invited her into the VIP area backstage, where Bieber "immediately took a liking to me" and supposedly asked her if they could "go somplace and be alone."

"We went, and on the walk to wherever his destination was, he asked, or he was telling me, that he'd like to make love to me, all sweet and cute and touchy, and then when we got to, it turned out to be a bathroom, his whole demeanor changed," Yeater tells the syndicated program. "It went from cute and gushy, you know, to just more aggressive."

Bieber himself smacked down the story Friday on NBC's Today, telling Matt Lauer that he "never met the woman" and that "none of those allegations are true." Citing an unnamed source close to the pop star, TMZ reports Bieber has agreed to take a DNA test and will fire back with a lawsuit of his own.

Despite getting death threats from the Bieber faithful, Yeater has continued to sound off on her allegations. Her increased media pressure even forced the "Baby" singer to address the issue after initially going on Twitter to tell fans he was just going to "ignore the rumors."

Around the same time, his reps issued a much firmer denial, accusing Yeater of making "malicious, defamatory and demonstrably false claims."

Bieber is also trying to play things as cool as possible.

Refuting reports that Selena Gomez had broken up with him in the wake of the paternity allegations, Bieber turned up with his steady in tow at last night's MTV Europe Music Awards in Belfast, Northern Ireland.

Take that, Yeater!