The 20-year-old California woman who’s claiming Justin Bieber is the father of her 3-month-old son breaks her silence this week in an exclusive interview with The Insider. Hit the jump to see the video.

Mariah Yeater says she got pregnant with her son Tristyn after 30 seconds of unprotected sex with the Never Say Never star in a backstage bathroom at the Staples Center in Los Angeles following a concert in October of 2010.

Yeater described to the show how the tryst developed: “He immediately took a liking to me and we just got to talking and then he eventually asked me, ‘Do you mind if we can go somewhere and be alone?'”

Yeater said the place Bieber, then-16, wanted to be alone with her “turned out to be a bathroom, and his whole demeanor changed.”

Asked what she exactly has to back up her claims, Yeater said she’s provided evidence to her attorneys.

“It’ll show in court to prove that my allegations are true,” she said, declining to go into detail about her evidence.