'Pretty Little Liars' Reveals A.D.'s Identity, Twitter Freaks Out

Pretty Little Liars just aired its series finale, but it wasn't going away without one final twist for fans to freak out about.

(Spoilers ahead, of course)

Over the last couple seasons of PLL, the Liars have been harassed by the mysterious A.D (also known as Uber A) over the death of Charlotte DiLaurentis. (A.D. is not to be confused with the show's original antagonist, A.)

In the series finale, "Till Death Do Us Part," A.D.'s identity is revealed to be Alex Drake, the secret British twin sister of Spencer.

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Apparently Alex met Charlotte while the latter was travelling in England and became close, according to The Wrap. With the assistance of Mary Drake, the girl's mother (who recently escaped prison), Alex set out to ruin the Liars' lives after Charlotte's death.

Alex also apparently pretended to be Spencer during several key scenes.

As with any big TV twist, Twitter was absolutely freaking out when the "Twincer" twist was revealed. Apparently it had been a conspiracy theory in fan circles online, but an evil twin just seems pretty off-the-wall of an option.

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