Pretty Little Liars may have you seeing double.

'Pretty Little Liars' Season 5: 'A' Reveal Is 'Twisted' & 'Very Dark', Sasha Pieterse Teases Finale

The season 5 finale is almost here, and "Welcome to the Dollhouse" promises to reveal the identity of the ever-elusive 'A'. Series creator Marlene King has dropped a few hints as viewers prepare for the big unveiling, including a little info on the wildly popular "twin theory."

Pretty Little Liars has never followed Sara Sheppards' PLL novels to the letter, but the ABC Family series may put a spin on the source material's usage of twins. In the books, Alison DiLaurentis finds out that she has a twin sisters, Courtney, who than becomes another 'A' suspect.

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Speaking of the finale, Kings informed BreathCast that "there is a reason why we keep dropping these not-so-subtle clues about the twins, so I would say wait for it. You're not going to see Courtney, but you may see double of someone."

So, who could this double be? With the (allegedly) deceased Mona returning during "Welcome to the Dollhouse," many viewers believe the former little 'A' could have a double.

Do you think Mona has a twin? Tell us your favorite theory in the comments below!

Find out more when Pretty Little Liars airs Tuesdays at 8 p.m. ET on ABC Family. Click the video below to see a preview for the finale.

Tags: pretty little liars television ABC Family