New Jersey Shore cast member Deena Cortese may fit in nicely to the Shore family now, but her welcoming wasn't always a warm one.

When the series returns Thursday, viewers get a peek at what happened when Cortese first set foot in the shore house.

Cast member Ronnie Ortiz-Magro was especially skeptical.

"Snooki walks through the door with this gremlin lookalike, and she says she's the new roommate," Ortiz-Magro says. (Watch a sneak preview above)

Later, when the new roomie brandishes booze, all is forgiven.

"She looks like she's ready to party!" enthuses Pauly D.

Jersey Shore's Vinny Guadagnino tells it was just like the old days when filming the new episodes.

"Deena is really fun, she's like another Snooki. You can't go wrong with that," he tells Us. "You can't go wrong when you mix another crazy person like that on the Jersey Shore."

Jersey Shore's new episodes premiere Thursday at 10 p.m. (EST) on MTV.