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Jen Harley makes a second appearance on this season of "Jersey Shore: Family Vacation" -- and the cast has no idea what to expect.

"Jersey Shore: Family Vacation" is about to reach new heights of drama. Don't these people know vacations are for relaxing?

In a sneak peek of Thursday's episode, Ronnie Ortiz-Magro's baby mama, Jen Harley, decides to join the group for a night out. Prior to her arrival, the gang of guidos/guidettes are seen discussing what they should expect from the woman who, weeks prior, was arrested for domestic battery after allegedly hitting Ronnie in the face and dragging him with her car. Oh, and their then-2-month-old daughter, Ariana, was there when this all went down.

"When's Jen coming? Tonight?" Vinny Guadagnino asks Ronnie in the preview clip below. "Are we taking her phone? And her car?" Ron lets out a halfhearted laugh.

"Is she cool with all this joking around and stuff?" Deena Cortese's husband, Chris, asks Ron, who tries desperately to convince Chris, himself and anyone who will listen that Jen's totally cool and fine and non-confrontational.

Mike "The Situation" Sorrentino then tells Ronnie that Jen hits up his fiancée, Lauren, "all the time," saying things like, "Oh, I can't wait to do a double date!"

"Next day -- Ronnie dragged from a vehicle," Mike jokes as he pretends to read a headline. Pauly D joins in, adding "Ronnie drops charges."

Over at the girls' table, Deena predicts Jen will also be joking about the ordeal, but Lauren says there's no way neither she nor Ronnie are healed from it.

"Physically not even healed!" Jenni "JWoww" Farley interjects.

"You think she's crazier than you?" Angelina Pivarnick asks Jenni, who quickly responds, "Legitimately crazier than me."

A second preview clip teases Jen's arrival -- and it's painful.

The group is out to dinner when she arrives, and when Ron steps out to go get her, the tension at the table is palpable.

"This shit's gonna be mad awkward," Pauly says. "Somebody's gotta call her out, though."

After Jen gives a few of the cast members some half-assed side hugs, the group sits in uncomfortable silence until Jenni eventually blurts out, "Your mug shot -- you look hot!"

"Wooooow," Mike replies. Angelina adds, "Ohhhhh, boy."

"Jersey Shore: Family Vacation" airs Thursdays at 8 p.m. on MTV.

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