Pretty Little Liars will go down as one of the most bonkers shows in TV history, naturally the series finale wasn't an exception.  

In the big episode, titled "Till Death Do Us Part," Uber A, or A.D., was finally revealed. And here's your one spoiler warning! Who's A.D.? That's none other than Alex Drake. Who's Alex Drake? Why she's Spencer's (Troian Bellisario) twin sister! Get the full story right here.

Bellisario told Elle that she's know about the twist since the end of season five when series creator I. Marlene King gave her the big pitch.

"It's been real rough. But for a long time, people would ask, "Who's A.D.?" And I'd say, ‘It's me!' And everyone would just laugh. It's kind of great when you have a secret that so few people—only me, Marlene, and a handful of others at that point—know. It means you can hide in plain sight," Bellisario said about keeping the secret.

The reveal was years in the making—but did viewers like it? See where the Pretty Little Liars series finale ranks among TV's big endings right now.

Girls Finale, Lena Dunham, Allison Williams, Becky Ann Baker

HBO

The Good Wife

CBS

Dexter, Finale

Randy Tepper/Showtime

Big Love Finale

HBO

How I Met Your Mother

Ron P. Jaffe/Fox

Seinfeld Finale

NBC

Weeds

Michael Desmond/SHOWTIME

MATTHEW FOX, Lost, finale, Best TV Quotes

ABC/Mario Perez

The Shield Finale

FX

Kiefer Sutherland, Mary Lynn Rajskub, 24

Greg Gayne/FOX

Angel, Finale

The WB

James Gandolfini, The Sopranos

HBO

Benjamin Bratt, Kate Walsh, Private Practice

Ron Tom/ABC

True Blood

HBO

The O.C.

FOX

Desperate Housewives

ABC

The Wire Cast

HBO

Scandal Series Finale

ABC

Gossip Girl

Giovanni Rufino/The CW

Two and a Half Men, Ashton Kutcher, Jon Cryer

Michael Yarish/Warner Bros. Entertainment Inc

Pretty Little Liars

Freeform

One Tree Hill

CW

House, Finale

Fox

Crazy Ex-Girlfriend

CW

Vincent Kartheiser, Jon Hamm, Christina Hendricks, John Slattery, Mad Men

AMC

Alias, Finale

ABC

Six Feet Under Finale

HBO

30 Rock, Tina Fey, Jack McBrayer, Jane Krakowski, Alec Baldwin, Tracy Morgan

Art Streiber/NBC

Fringe

Fox

Shadowhunters

Freeform

Gotham

Fox

The Vampire Diaries finale

The CW

Steve Carell, The Office

Chris Haston/NBC

Buffy The Vampire Slayer, Finale

The WB

Revenge, Emily VanCamp, Gabriel Mann

ABC

Sons of Anarchy, Charlie Hunnam

Prashant Gupta/FX

Teen Wolf Finale

MTV

Best Sex and the City Finale

HBO

Grimm series finale

NBC

Broad City, Series Finale

Matthew Peyton/Comedy Central

Bones series finale

Fox

Friends, The Last One

NBC

Glee, Season 6, Cast

Brian Bowen Smith/FOX

Person of Interest

CBS

Breaking Bad

Ursula Coyote/AMC

PARKS AND RECREATION

NBC

Parenthood, Cast

Joe Pugliese/NBC

What's your favorite TV finale? Tell us in the comments below.

Be sure to stay tuned to E! News for more Pretty Little Liars finale scoop.

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