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Time to fist-pump for a little guido or guidette-to-be!

After weeks of rumors, Nicole "Snooki" Polizzi confirms exclusively in the new Us Weekly that she is 15 weeks pregnant -- and engaged to the father, beau of one and a half years, Jionni LaValle.

PHOTOS: Snooki's craziest antics ever

And the "Jersey Shore" star and LaValle, both 24, know just what detractors are thinking, they tell Us.

PHOTOS: Snooki's wild, sexy style

"I have different priorities now," reformed party girl Snooki says. "I don't care what anybody else thinks. As long as I know I'm ready and he's ready."

Adds LaValle: "We are not going to screw this up."

VIDEO: Snooki gushes about her man Jionni

The once pouf-haired star and LaValle discovered the news "right after New Year's," she said. Snooki's first thought? "'S---, I've been drinking!' I was worried. It was New Year's Eve and we were in Vegas, so I did go crazy," she admits.

For much more of our exclusive sit-down and photos with Snooki and her man -- why she initially lied about the pregnancy, how they found out, her cravings, how he proposed, their wedding plans and other details -- pick up the new Us Weekly, on stands Friday!