"Pretty Little Liars" - "Mona-Mania!": LUCY HALE, ASHL

"Pretty Little Liars" - "Mona-Mania!": LUCY HALE, ASHLEY BENSON
Aria, Emily, Hanna and Spencer are sure that Mona is up to her old tricks again, but can they prove it, in "Mona-Mania!," an all new episode of ABC Family's hit original series "Pretty Little Liars."
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