The brunette star wore a floor-length black backless gown as she posed for photos at the Nokia Theatre in Los Angeles on Sunday evening (13 April).
Jwoww was joined by her fiancé Roger Mathews, who looked proud as punch as he stood next to his pregnant partner and posed for the obligatory hand on stomach shots.
Reality star Jwoww announced her pregnancy on Christmas Day, saying that she and Roger were thrilled to be starting a family together.
She later revealed she's expecting a baby girl.
"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," she wrote.
"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!"
Loved up Jwoww and Roger were at the MTV Movie Awards after jetting back to the US from an eight-day holiday to Mexico, where Jwoww told fans she was working on her tan for the awards.
They became engaged in September 2012 after Roger proposed while they were skydiving. Really! He popped the question with a 7.5-carat pink and white diamond ring.
Jwoww, 28, isn't the only pregnant Jersey Shore star around, however: her best friend and co-star Snooki announced last week that she's pregnant with her second child. Snooki is already mum to son Lorenzo, one.
The friends currently star together in reality show Snooki & Jwoww.
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Pictures from the MTV Movie Awards 2014 below:
Copyright: WENN FayesVision