The reality star announced her happy baby news via a blog post on Christmas Day, saying that she and fiance Roger Mathews are over the moon to be starting a family.
"Roger and I couldn't have asked for a better Christmas gift this year!" said JWoww.
"We wanted to share this exciting news with you all first because you have been a part of our lives these past few years and seen the love between Roger and me develop and blossom. We are so excited to share this new chapter of our lives with you as we become parents and create more memories with a new addition to our family!"
The brunette thanked fans for their love and support throughout the years, concluding: "We are extremely happy and cannot wait for our bundle of joy to arrive! Happy holidays from our growing family to yours!"
Among those sending congratulations to the parents-to-be was JWoww's Jersey Shore co-star Snooki, who gave birth to baby son Lorenzo in 2012.
Snooki and JWoww currently star together in their own spinoff reality series.
"IM SO EXCITED MY BEST FRIEND @JENNIWOWW IS PREGNANT!" tweeted Snooki. "Finally we can be MUMS together love you boo! I got you."
Congrats to JWoww and Roger!