(Cover) - EN Showbiz - Mariah Yeater says Justin Bieber went from "cute" to "aggressive" during their alleged tryst.

The 20-year-old claims that the singer is the father of her three-month-old baby.

Mariah has broken her silence for the first time by giving an interview to The Insider.

"He immediately took a liking to me," she says in the interview. "We got to talking and he eventually asked me, Do you mind if we could go somewhere and be alone?' When we got to what turned out to be a bathroom his whole demeanour changed, it went from cute and gushy to just more aggressive."

Mariah says she got pregnant with her son Tristyn after the alleged rendezvous with the star at the Staples Center in Los Angeles following a concert in October 2010.

Justin has denied the claims and says he has never even met Mariah.

Mariah is prepared to go to court with her claims and have a DNA test. She says she has provided her attorneys with evidence that Justin is the baby's father although she would not comment further on what that proof is.

"I have provided evidence to my attorneys," she explained. "It'll show in court to prove that my allegations are true."

Last night Justin attended the MTV Europe Music Awards (EMAs). The 17-year-old and his girlfriend Selena Gomez put on a happy, united front.

The star hinted at the paternity rumours when he collected his second award of the night for best pop.

"Yo, two awards in the past 60 minutes. There's been a lot of c**p on the internet lately, but I've pulled through," he announced.

A child support hearing is scheduled for December 15. (C) Cover Media