The red-headed star, who recently passed the five-month mark, shared a picture to Instagram over the weekend showing herself posing with a protective hand on her growing bump.
"Filling this sundress out!" she told fans.
Reality star Snooki - real name Nicole Polizzi - has previously revealed that she's expecting a baby girl with fiancé Jionni LaValle. They are already parents to son Lorenzo, one.
Earlier this month, when complimented on her figure, the star said she was working out a lot more during this pregnancy than she had with Lorenzo.
She told fans she'd been in a "good mood" since discovering her pregnancy, which she partly puts down to her exercise regime. Known for being a fitness fanatic, the star has continued to work out, altering her routine to take account of her pregnancy.
"I'm working out and my endorphins are awesome, but this pregnancy is so much easier than my first! I think because I know what not to do now," she said. "We can still be active and still be careful while pregnant! My bump had definitely popped a lot more and it's adorable.
"I do have my days where I cry in Indian style over nothing, and scream at Jionni like he had an affair, but other than that I'm good! LOL… No one ever has a perfect pregnancy, But I'm perfecting mine!"
Yesterday, Snooki spent the day with adorable son Lorenzo, marking Mother's Day in the US.
In a touching message to Jionni, alongside a photo of Lorenzo, she wrote: "Wanna thank my man for blessing me with this beautiful nugget! My son is my world and he makes my life happier & brighter. I love you so much squirrel and so lucky to be your mummy. Thank you for being an awesome son! Love mummy."
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Celebrities who announced pregnancies in 2014 in pictures:
Copyright: WENN Lexie Appleby/Future Image/Bridow/Instagram