Jamie McCarthy/Getty
Lesley Messer
September 05, 2012 12:45 PM

For the past few summers, Nicole “Snooki” Polizzi relished going to the Jersey Shore while film crews captured her every salacious move.

But last summer, when the 4’9″ reality star was entering her third trimester (she welcomed son Lorenzo Dominic with fiancé Jionni LaValle on Aug. 26), everything felt different.

“It was definitely a little lonely,” Polizzi, 24, reveals. “Everyone was still going out and staying up late and I just wanted to go to bed at 8 o’clock. I didn’t want to do everything that everyone else was doing.”

As she says in this week’s cover story, Polizzi became “a new person” after discovering she was pregnant with her son. “Everything changed,” she reflects. “The partying is long gone.”

RELATED: Snooki Introduces Lorenzo

And while Polizzi says she had the support of LaValle and her cast mates (especially Deena Cortese and Jenni "JWOWW" Farley), she’s not sorry that this will be the last installment of the popular reality show.

“It’s bittersweet,” she says. “But my life has changed. I have a family now!”

The final season of Jersey Shore premieres Oct. 4 at 10 p.m. ET.

For exclusive photos of Lorenzo –plus details about Polizzi’s delivery, upcoming wedding, weight loss plan and life as a mom – pick up this week’s issue of PEOPLE, on newsstands Friday

MTV PHOTOS: See Snooki at home with Lorenzo & Jionni

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