Pretty Little Liars: Before They Were Stars

Troian Belliario: Then

Assuming small roles in her TV producer dad Donald P. Bellisario's shows Quantum Leap and NCIS, Bellisario appeared alongside Mary-Kate and Ashley Olsen in the film Billboard Dad. "When I was 5 years old, my best friends were Mary-Kate and Ashley," she tells Us. "I just knew them as the girls across the street!"

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