she appeared alongside her partner-in-crime JWOWW to promote their new MTV spin-off, Snooki & JWOWW.
Snooki said she sprang the big surprise on JWOWW when they first moved into their new place.
"At the last moment, I'm like, "I'm pregnant ... alright, let's do this," Snooki said.
"It was like an episode of Punk'd -- I was shocked!" said JWOWW.
JWOWW said when the normally hard-partying Snooki found out she was expecting, "she did a 180.
"Overnight, no drinking, no smoking, no partying -- it was all over with the day she found out she was pregnant."
JWOWW said her pal is "enjoying" her pregnancy, adding she's "never seen someone, like, embrace pregnancy the way that she has."
Asked why she feels she'll be a great mom, Snooki said, "I just think I have a great heart: I feel like I'm gonna love my baby like crazy."
Snooki & JWOWW premieres Thursday at 10/9c on MTV.