The big moment was actually a surprise to Snooki, too. "Jionni knows what we're having, and he put balloons in a bin for [me and Lorenzo]," she said in the clip. "So we're going to find out what we're having right now, and we're so excited."
Then, turning to her son, she said, "You ready? You're gonna have a sister or brother. No, you don't want it now? You want to be an only child? Well, you're not."
She then popped the lid off the bin to reveal -- she's having a baby girl.
We can't wait to see the tiny tot become a big brother!
Click "Launch Gallery" below to see more of Snooki's TwitPics of baby Lorenzo.