'Jersey Shore' Tea-Shirt Time: Ronnie Crashes Deena's Gender Reveal Before Dropping a Bomb in Atlantic City

Thursday's "Jersey Shore: Family Vacation" was a lot of buildup for next week's insane drama, but lots of not-so-insane stuff still happened! First up was Deena Cortese's gender-reveal party.

Surrounded by family, friends and Ronnie Ortiz-Magro -- who pleasantly surprised everyone by showing up unannounced -- Deena and her husband, Chris, found out they were having a baby boy. Chris was thrilled. Deena was happy, too.

During the party, Ron pulled Deena aside to let her know how important it was for him to be there for her. He felt awful he didn't go to her father's funeral (they hashed that out in Miami -- it was Sam-related), and she was touched! It was a precious moment.

Next up was a joint birthday celebration for Mike "The Situation" Sorrentino and Pauly D at -- wait for it -- Dave & Buster's. Fittingly, Mike got a cheeseburger cake, and Pauly got an Italian flag cake. After going to town on the "foods," the boys opened their presents. Among other things, Mike got a police hat (which is ironic because he's going to prison for tax evasion), and Pauly got a bedazzled megaphone (which is ironic because he doesn't need one). 'Twas another splendid day for the guidos/guidettes.

Pauly then extended an invite to the group -- plus everyone's plus-ones -- to accompany him at a DJ gig in Atlantic City, which is often referred to as the Las Vegas of the East Coast. What could go wrong -- besides everything?

Unfortunately, Nicole "Snooki" Polizzi was unable to go, but everyone else was. Deena brought Chris, Mike brought Lauren, Angelina Pivarnick brought her fiancé (also Chris) and Ronnie dropped a bomb on the group by announcing his on-again, off-again baby mama -- Jen Harley -- would be meeting up with them, too.

The group was shocked. Jenni "JWoww" Farley even spit out her wine! Last everyone heard, Jen had been arrested for domestic battery after she allegedly hit Ronnie in the face and dragged him with her car, but Ronnie assured them all was hunky-dory now.

"Can I get everyone's attention for a second," he said during the group's fancy steak dinner on night one in AC. "So, obviously, there's a lot of stuff that's been going on with me and Jen, and she is in town and she's here, and I would love for her to be with us this weekend. Would you guys mind if she would come to Pauly's gig tomorrow and just hang out? We're all a family. I wanna put it out there, and I don't wanna make people feel uncomfortable."

Again, Jenni literally spit out her wine.

"No tit for tat bullshit," she warned Ron, who replied, "It's ended. We've actually been good recently. I just needed shit to be aired out. It was, and I'm good."

"I mean, she can come," Vinny Guadagnino added. "I've always wanted to be on TMZ!"

"What the f--k, Ron?" Jenni later told cameras. "You didn't go to Seaside 'cause you were dragged by a car, and now you're like, 'Yeah, be cool with her.' Like, I don't know where to go with this. This is next level mindf--kery."

During his confessional, Vinny echoed Jenni's concerns, saying, "Ron is telling us that the fighting with Jen has ended. That's like him saying that the fighting with Sam has ended, which we all know has never ended. Obviously, we're all terrified. He's gonna do what he wants anyway, so there's not much we can do."

Meet us back here next week to find out what goes down when Jen arrives in AC.

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

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