Mariah Yeater Walks Out Of Interview, Says She'll Take Lie Detector Test (VIDEO)

In a series of interviews she filmed for "The Insider," Mariah Yeater has defended her position as the mother of Justin Bieber's child with stern, solemn-faced talk of "having proof" and publicly stating that she'd take a lie detector test. But after viewing the clip of Justin Bieber telling Matt Lauer on the "Today Show" that he had never met Yeater, the 20-year-old California woman, who alleges the two had sex in a bathroom after Bieber's concert when she was 19 and he was 16, visibly broke down.

"Could any of those other girls that were in that room substantiate your story?" interviewer Kevin Frazier asks Yeater in the clip, who claims that she was taken backstage by a security guard with a host of other women before Bieber singled her out.

An emotional Yeater breaks down and looks around the room confusedly as Frazier presses on: "I know it's tough, but could one of the girls substantiate the story?"

Yeater responds by walking out.

In the meantime, Bieber has announced that he will take a paternity test once he returns to Los Angeles before taking Yeater to court.