She also said she won't film any "Jersey Shore" this summer.
In an interview with Us Weekly magazine, Polizzi said: "If anything, I'll visit the shore. I'm not living in that house being pregnant. I don't want to be one of those moms who's pregnant in a club. It's disgusting."
The pint-sized 24-year-old and the unborn baby's father, 24-year-old Jionni LaValle, ended weeks of speculation by opening up to the magazine about their happy news, discussing the baby's gender, Polizzi's morning sickness and weird food cravings, and how they plan to parent.
Polizzi had been denying the pregnancy rumors for weeks, and told the magazine she didn't want to share the news before the end of her first trimester.
"I wanted to make sure the baby is OK. Things can go wrong, like a miscarriage. It was my business, and I wasn't ready to tell," she said.
Even though the baby wasn't planned, she and LaValle said they were ecstatic when they found out - and went through five pregnancy tests to be sure.
Albert Lee, the executive editor of Us, told "Good Morning America" that Polizzi noticed shortly after the new year that she could be pregnant.
"Snooki and Jionni were in Las Vegas for New Year's Eve, they were partying it up, ringing in the new year, the week after that Snooki noticed she was a week late and she actually told us that she always carries a pregnancy test with her, and whenever she's late, she does a test just to make sure. … She said her first thought was that she freaked out because she did go out and party quite a bit on New Year's Eve, but obviously those days are now over for her, she's done with the booze, she's done with the partying. She's fine with putting all that on the back burner while she prepares for motherhood," Lee said."
But not everyone was as happy about her impending motherhood, she revealed.
"My dad was upset. He said, 'You have your whole life ahead of you.' We didn't talk for a week. He came around eventually, and now he can't wait for the baby. My mom is so happy for me," Polizzi told Us.
The pair are split on the gender of the baby - he apparently wants a boy and she wants a girl.
"She wants a cheerleader, and I want an athlete," LaValle said, according to the article. "If it's a girl, she is not dating until she is 18."
To which Polizzi replied: " I'm letting her date. I started dating at 13."
Polizzi has become world-famous for her antics on the hit MTV reality show, in which she's seen getting drunk or fighting. She's even gone to sleep in a dog bed.
She won't miss those party times during her pregnancy, she said.
The pair don't plan to wed for at least another year - to give her time to lose weight and for the baby to be part of the wedding.
And will Polizzi allow the baby to watch "Jersey Shore" someday?
"It's going to happen either way. They can Google it and watch behind our backs. So I'm going to talk to them about it. I'll say, 'This is what not to do,'" she said.
With Snooki vowing to stay away from JWoww and the crew during her pregnancy, TV experts are left to wonder what will happen to the ratings monster that is “Jersey Shore.”
“There’s no question not having Snooki on 'Jersey Shore' on MTV on a weekly basis would be a real challenge for MTV,” Lacey Rose, senior writer for The Hollywood Reporter told “GMA.” “She is a big reason why people tune in.”