Jenni 'JWoww' Farley, Roger Mathews

Jenni "JWoww" Farley and Roger Mathews attend the NewNowNext Awards in Los Angeles, (Michael Buckner / Getty Images / April 13, 2013)

It'll be a girl, or "guidette," for "Jersey Shore" alum Jenni "JWoww" Farley.

The pregnant 27-year-old reality-TV star shared the news with Us magazine, adding that she and fiance Roger Mathews were "super excited and super emotional" to find out their baby's gender.

"I pictured a boy this whole time, so when I saw 'girl' on the paperwork, I was like, 'No way!' But deep down I think I knew," she said. "[Snooki's son] Lorenzo is gonna have a BFF, and I couldn't be happier!"

PHOTOS: The Hollywood baby boom

Snooki, of course, is Farley's BFF and "Snooki & ww" costar Nicole Polizzi, who welcomed her son with fiance Jonny LaValle in August 2012. Farley told People magazine that they couldn't wait for the arrival of their "little princess and Lorenzo's future girlfriend."

"YAY finally I can go shopping with [JWoww] for BABY GIRL THINGS!," Polizzi tweeted Wednesday. "Lorenzo's so excited!"

Farley, who initially publicized her pregnancy with a Christmas card in December and is due in July, said the new addition would be her "best friend and daddy's little girl."

QUIZ: Test your 'Jersey Shore' vocabulary

"I can't wait for everything from her first steps to her first dance class," she told Us.

However, the pumped-up party girl wasn't so pumped about her future daughter's teenage years.

"I was a teenage girl once, and, boy, do I know how sneaky we can be!" Farley told the magazine. "Karma is gonna kick me in the butt with her!"

PHOTOS: The celebrity parenting handbook

As for Mathews, the proud papa-to-be was a little preoccupied with demystifying the female psyche all over again.

"Been 4 years trying to figure out one girls brain. Now I get to try and figure out another one. Grey hair is in my immediate future," he tweeted, telling a follower he had his work cut out for him because "Mom is half crazy and that's a strong gene."

ALSO:

Katy Perry glams up GQ cover, defends geisha furor

Sorry boys, Selena Gomez is feeling her girl power right now

Robert Pattinson's Dior deal has 'profound' effect: He moisturizes

Follow Ministry of Gossip @LATcelebs.