Kelsey Balzafiore, 20, punched the former reality show star inside the Staten Island Mall, according to the lawsuit filed by Pivarnick's lawyer Stephanie Ovadia in New York last week.
Pivarnick and her friend Janina Vaiana were shopping at Hot Topic in October last year when a group of youths approached them and a fight broke out.
Following the incident, Balzafiore was arrested on misdemeanor battery charges for allegedly punching Vaiana, but Pivarnick now claims she was also attacked by her.
Pivarnick was "assaulted, battered and harassed," according to court documents, and left "wounded, bruised, and injured and sustained severe shock to her nervous system."
The former "Jersey Shore" girl, who featured in the first two series of the MTV reality show, is also suing Hot Topic over their security arrangements.
She is demanding unspecified damages.