EXCLUSIVE: 'Pretty Little Liars' Author Sara Shepard Coming to the Show - Find Out Who She's Playing!

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We've got a secret — and we just can't keep it!

There's a very special guest coming to Pretty Little Liars this season, and only ETonline has the exclusive scoop.

Sara Shepard
, the author who penned all 16 PLL books, and created the Rosewood residents we've come to know and love, will be appearing in an upcoming episode of the smash ABC Family drama.

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Fun-Fact: This is not Shepard's first time on the murder mystery series. The bestselling author originally made her Rosewood debut way back in season one as a substitute filling in for Mr. Fitz (Ian Harding).

"It was really fun!" Shepard spilled to ETonline of her second role in the PLL world. "I only had a couple of lines, but I was on the show in the first season. I don’t act, it's not my thing, and I was really nervous that time, but this time around, I felt a lot better about it."

This time, the Pittsburg resident flew out to the PLL set to play a news reporter who will be commenting on the current craziness in Rosewood. Shepard will guest star in episode 24 — the penultimate episode of Season 5 — which is slated to air March 17.

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"They were so nice to bring me back. I couldn't believe it," she recalled. "I talked to [executive producer] Marlene [King] and she was like, 'We wrote a part for you!' and I was like, 'You're kidding!' It was so sweet for them to have me back."

Shepard published her first Pretty Little Liars book back in 2006, and now, nearly a decade later, her characters and crazy 'A' antics, have sparked the creation of TV's most social media-savvy series. (More on that later, little liars — so stay tuned…)

"I love going [to the PLL set], it's my favorite place it be," Shepard gushed. "It's amazing. It's like this whole little city of people working on this show, and it's from these books that I just thought were going to be books."

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Pretty Little Liars
airs Tuesdays at 8 p.m. on ABC Family.

Are you excited to see Shepard on another episode of Pretty Little Liars? What craziness do you think the author will be reporting on? Sound off in the comments below or theorize with @LeanneAguilera on Twitter!

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