Fans began to speculate that the mother-of-two was expecting again after she walked the red carpet at the MTV Video Music Awards on Monday, August 26.
"I see a baby bump," one fan wrote in the comments section on her post from the event. "Preggers," another added.
Zack, 24, decided to put the chatter to rest on Tuesday night. "Jenni is NOT pregnant. Stop being idiots," he wrote on his Instagram Stories.
JWoww shares daughter Meilani Alexandra, 5, and son Grayson Valor, 3, with ex Roger Mathews, 45.
What do you think of Zack's strongly worded pregnancy denial? Sound off in the comments below!