ABC Family/Ron Tom

"I'm so obsessed with it," Mitchell gushes about the Netflix series. "All of us have watched it, so we were actually on set and we were playing off different characters. It was really fun shooting those episodes!"

And after five seasons of theorizing and speculation, Mitchell is excited for fans to learn the big "A" secret, telling us, "I think they're going to be very happy. I think they too are going to love this episode and they're going to be on the edge of their seats the entire time because it's action-packed, the sets are beautiful, the costumes are out of this world."

As for what she predicts will be a trending topic during the finale, which may very well break the Internet tonight, Mitchell guesses #crAziest: "Honestly, all of the girls and I think this is the most insane episode thus far. That's something to say when all of our episodes are amped up all the time."

Woah. To hear more from Mitchell about PLL's finale, watch our interview with her above!

Make sure to watch Pretty Little Liars' season finale tonight at 8 p.m. on ABC Family.