- Is of Spanish and Irish descent.
- In 2011 she and then boyfriend (now husband) Roger Mathews lost a baby due to miscarriage almost at the same time when Jenni's grandmother has died.
- (October 18, 2015) Married her boyfriend of nearly 5 years, Roger Mathews in front of a group of family and friends, that included her Jersey Shore (2009) cast-mates Nicole Polizzi and Paul 'Pauly D' DelVecchio, and The Bachelorette (2003) alums Trista Sutter and Ryan Sutter, following a 3-year-long engagement. They have 15-month-old daughter Meilani together.
- Is a graphic designer and club promoter.
- Has 2 children: daughter, Meilani Mathews (b. July 13, 2014) & son, Greyson Mathews (b. May 5, 2016) with ex-husband, Roger Mathews.
- Her son Greyson has autism.
- Engaged to Zack Carpinello since February 27, 2021: her 36th birthday.
- (September 12, 2018) Filed for divorce from her husband of nearly 3 years Roger Mathews.
- Has a black belt in taekwondo.
- Has celiac disease.
- Raised by her father.
- Jenni & Roger finalized their divorce on August 29, 2019.
- Has an arm covered with Disney character tattoos.
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