According to TMZ, Yeater told former boyfriend John Terranova that he had gotten her pregnant when she arrived at his home in December 2010.
Terranova's grandmother Frances Lippe told the website that the pair had dated towards the end of high school and Yeater arrived at their Las Vegas home at the end of last year.
When Terranova denied that he was the father of Yeater's child, an argument allegedly escalated into violence.
Lippe claimed that the 19-year-old mother smashed a car window, resulting in the police being called. When she returned at a later date to agree payment for the broken window, Yeater allegedly slapped her former boyfriend three times in the face.
Yeater has apparently been charged with battery and has a court date set in Las Vegas. However, Yeater's lawyers did not respond to calls for comment.
Earlier today, Bieber denied Yeater's claims that he has fathered her 3-month-old son Tristyn, telling the Today show: "To set the record straight, none of it is true."
Watch the video for Justin Bieber's 'Baby' below: