- She is fluent in American Sign Language.
- Automobile enthusiast and used to spend time racing at the drag strip. And also knows how to ride a motorcycle. Used to ride a Kawasaki ninja sport bike.
- Is a champion chess player.
- Was a stunt person in a live western stunt show.
- On the set of The Graves (2009) her fist accidentally went through a glass door mid scene. She continued the scene drenched in blood. In the final cut of the film you can still see the glass wedged in her finger.
- A character's image in the sci-fi universe of the Mass Effect (2007) video games trilogy, Liara T'soni, was created using Jillian's face and body.
- (September 14, 2017) Married her boyfriend of 7 years Dean Geyer following a 9-month-long engagement. They exchanged custom vows in front of 75 of their closest family and friends at a boutique venue in Santa Ynez Valley.
- Mother's family is Scottish and fathers family is Irish.
- Went to the same high school in Wyomissing, PA, as Taylor Swift.
- Is in a relationship with (her now husband) actor Dean Geyer since October 2010.
- Jillian has a teacup Yorkshire terrier named Bijou.
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