In 1998, she co-starred with Mary-Kate and Ashley Olsen in the film Billboard Dad. Beginning in 2006, Bellisario began appearing in a number of independent short films namely, Unspoken, Archer House and Intersect. She was seen in the theatrical motion picture Last Rites, as well as the independent films Peep World and Consent.
On stage, she appeared in "Farragut North" and "Equivocation" at the Geffen Playhouse in Los Angeles. With The Casitas Group, a theatre company of which she is a founding member, Bellisario appeared in an exclusive engagement of Martin McDonagh's "The Pillowman," as well as a Sam Shepard double feature: "Fool for Love" and "True West."
She has also performed in university theatre productions of "Rosencrantz and Guildenstern are Dead," "The Suicide," "All's Well That Ends Well" and "Machinal." In November 2009, Bellisario was cast as Spencer Hastings in the TV series Pretty Little Liars based on the book series of the same name by Sara Shepard.
Bellisario portrays Spencer Hastings, a straight-A student and overachiever from a family that only expects the best. With the pressure bearing down on her from her family, Spencer feels like she must live up to the high standards set by her perfect sister Melissa. In 2011, the Teen Choice Awards nominated her for Best Female Actress. Besides Troin, the series also stars Ashley Benson, Shay Mitchell, Lucy Hale and Sasha Pieterse.
Bellisario lives in Los Angeles, where she graduated from the University of Southern California's School of Theatre, earning a bachelor of fine arts in acting. She enjoys dance, writing and playing the guitar.
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