Nerd alert! When JWOWW asked fans to help her pick a Halloween costume that would be "even hotter" than last year, who knew that would mean the addition of...more clothing?! This weekend in Sin City, the "Jersey Shore" star uncharacteristically covered up in head-to-toe dweeby duds that included thick-framed specs, plaid pants and a conservative button-down that showed no trace of cleavage. Her fiance Roger played the part of her study buddy, complete with a pocket protector, suspenders and a bow tie. "Nerd status at @chateaulv last night! So much fun with @DJSKRIBBLE and my crew," she tweeted. Jenni's castmate Sammi, for one, loved the look. "@JENNIWOWW @RogerMathewsNJ nerds squad! Lmao ur costumes were perfect," she replied.

There was plenty of Pauly D to go around in Vegas, too. The DJ, doing it up as Dracula, had a frightful run-in with a bobblehead version of himself. "Happy Halloween!!!" wrote the fist-pumper from a party at the Hard Rock.

Maci Bookout went for a group-themed getup, rocking a Teenage Mutant Ninja Turtles costume with her posse, yet earlier in the day, the former teen mom sported country attire, including a kerchief that matched her son Bentley's bronco-bustin' look. "My little cowboy turned four today!! such an awesome day! #blessed...," she gushed.

Also horsing around: Kailyn Lowry's son Isaac, who dressed up as lovable cartoon cowboy Woody. "Salisbury trick or treating! #7daysofHalloween," the "Teen Mom 2" cast member posted.

Looking good, kiddos! Now let's see what else you've got up your sleeves for October 31st...

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Photos courtesy of @JENNIWOWW, @DJPaulyD, MaciBookoutMTV, @kaillowry