The 20-year-old filed a paternity lawsuit this week claiming that she fell pregnant with her 3-month-old son Tristyn after sleeping with Bieber at a concert in October 2010.
Court records obtained by TMZ show that Yeater is due in court in Las Vegas on December 12 over allegations that she slapped her ex-boyfriend during a fight last Christmas.
The altercation is believed to have flared after Yeater's 18-year-old former partner discovered that his new girlfriend's car window had been smashed.
Yeater faces up to six months in jail and a $1,000 fine if found guilty. Her lawyer confirmed that she had previously pleaded not guilty to the charges, but refused to discuss the case further.
It was reported this week that Yeater could be investigated for statutory rape over her alleged fling with Bieber, who would have been just 16-years-old at the time.
Bieber said today that he is expecting to face more allegations about his private life in the wake of Yeater's claims.
> Justin Bieber's 'baby mother' Mariah Yeater 'made accusations before'