'Pretty Little Liars' [SPOILERS]: 'Big A' Revealed in Season Five Finale- "Can't Be Ready For It"

Today is the day that we Pretty Little Liars fans have been waiting for since the series started, and after 120 episodes, we are finally getting what we have spent many, MANY sleepless nights wondering. That's right, fans will finally learn who 'Big A' is, and while there have been many little reveals and false theories, including Ezra and Toby being 'A', the hooded villain or villainess will finally be exposed.

As we get ready for this momentous day in TV history, it seems that nothing will be able to prepare us for the intense reveal that is coming in the next couple of hours.

Even executive producer Marlene King took to her Instagram account to let fans know that this shocking discover is something that they will never see coming and won't be able to get ready for.

 You just can't be ready for it. #WelcomeToTheDollhouse

A photo posted by @imarleneking on Mar 19, 2015 at 11:40pm PDT

"You just can't be ready for it, #WelcomeToTheDollhouse," King captioned on an image of the liars reading their phones with the text, "The Biggest Reveal Ever,' written underneath.

While Marlene teases that fans won't be able to figure out who 'A' is before the episode airs, E! News has compiled a list of the five episodes that Marlene says to watch, which will give fans some insight into who 'A' might be.

1. "It Happen 'That Night'," – season three, episode 1
2. "A Dangerous Game," – season three, episode 24
3. "A is for Answers," – season four, episode 24
4. "Taking This One to the Grave," – season five, episode 12
5. "How the 'A' Stole Christmas," – season five, episode 13

The big 'A' reveal will take place tonight on the season five finale of Pretty Little Liars, and you better believe we will be watching to give you a recap on all the events as they happen.

Tune in to the episode tonight at 8 p.m. on ABC Family, and check in for our recap later tonight.

[Image courtesy of Pretty Little Liars/Facebook]