'PLL: The Perfectionists': Sasha Pieterse Reacts to Mona's Knife Moment in First Series Teaser (Exclusive)

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ET caught up with the actress at Freeform's Upfront presentation in New York, where she also promised there is still hope for 'Emison.' 'Pretty Little Liars: The Perfectionists' comes to Freeform in 2019.