Troian Bellisario is an actress who stars as Spencer Hastings in the ABC Family series "Pretty Little Liars."

Bellisario was born and raised in Los Angeles. Her parents are producers Donald P. Bellisario and Deborah Pratt. Donald P. Bellisario created "Magnum, P.I.," "Quantum Leap" and "NCIS," among other TV series. Bellisario graduated from the University of Southern California.

Bellisario made her acting debut in the 1988 film "Last Rites" at the age of 3. From 1990 to 2007, she guest starred on "Quantum Leap," "Tequila and Bonetti," "JAG," "First Monday" and "NCIS," television series that were produced by her father Donald P. Bellisario. In "NCIS" she played Sarah McGee, sister of Special Agent Timothy McGee, portrayed by her stepbrother Sean Murray.

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." 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. In October 2011, Bellisario announced she was in the process of writing and creating her own film, which was successfully funded through Kickstarter on November 16, 2011.

In August 2012, Bellisario appeared alongside Jennifer Beals in the WIGS web episodes, "Lauren." The show returned in 2013 for a 12 episode run.

Bellisario revealed in early January 2014 that she went through personal problems through high school, resulting in an eating disorder and self-harming issues.

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