'Pretty Little Liars': Andrea Parker On That 'Amazing' Mary Drake/Spencer Reveal!

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On the set of "Pretty Little Liars," Andrea Parker talks with AccessHollywood.com about that Mary Drake/Spencer reveal from the midseason finale! Why does she think Mary waited so long to tell Spencer she was her mom? Plus, does Andrea have any favorite moments from set? "Pretty Little Liars" returns for its final 10 episodes on April 18 at 8/7c on Freeform.

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