The former Jersey Shore star made the announcement in a post on her official website.
"Roger and I have said from the beginning that, just like it was with Meilani, it does not matter which gender our baby is, as long as he or she is healthy," the 29-year-old wrote. "Still, we are so excited to be expecting a baby BOY!"
The newlyweds also have an adorable 15-month-old daughter Meilani.
After meeting while filming the MTV reality series, the pair got engaged in 2012.