Sofia Carson Spills 'Pretty Little Liars: The Perfectionists' Secrets and a Big Clue About Ava! (Exclusive)

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Sofia Carson's secret is out!

The Disney Channel darling has been added to the pilot of Pretty Little Liars: The Perfectionists, the buzzed-about PLL spinoff that could be headed to Freeform.

"To be a part of the Pretty Little Liars world is such an honor," Carson dished exclusively to ET. "It's still so surreal. It's been a secret of ours and the secret's out!"

Carson is set to play Ava, a beautiful, trendsetting blogger and coder who strives to be a fashion icon.

As of now, details surrounding Pretty Little Liars: The Perfectionists are being kept under wraps, but it was previously announced that the new series will welcome back PLL veterans Sasha Pieterse and Janel Parrish as Alison DiLaurentis and Mona Vanderwaal, respectively.

The potential spinoff, which is based on the novel The Perfectionists by Pretty Little Liars author Sara Shepard, is being developed and executive produced by PLL showrunner Marlene King.

Carson confessed that when she went in to audition for The Perfectionists, she could barely contain her excitement.

"I told [Marlene King] that I was just the biggest -- the biggest -- fan of Pretty Little Liars," the 24-year-old actress and singer gushed. "I was obsessed with it -- as so many of us were. It was such a phenomenon, so to be part of that legacy is truly an honor."

Carson continued, "And when I found out [that I got the role], Marlene called me last Monday and she was like, 'Guess what? You're my new Pretty Little Liar,' and I was like, 'Oh my gosh! That is the coolest thing! I will never ever get used to hearing that -- ever.'"

And it looks like Carson is already learning the PLL skills of keeping secrets! When we pressed the brunette beauty for additional details about her character, Ava, Carson was coy with her response.

"We have secrets that we have to keep here," she teased with a smile. "I can say that not everything is as it seems with her. That's all I can say."

Not worry, little liars -- all will be revealed!

In the meantime, Carson did have a lot to say about how excited she is to start production on the pilot. "I can't wait to work with Marlene and to learn from her and to be guided by her," she said. "I love her so much and respect her so much because she writes such empowered female characters [who are] so multi-dimensional and I can't wait to kind of dive into that universe."

Carson has also joined the cast of King's other Freeform drama, Famous in Love, which will return for its second season with a two-hour premiere on Wednesday, April 4.

For more news on Carson's Famous in Love character, press play on the video below!

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