Nicole 'Snooki' Polizzi and Jenni 'JWOWW' Farley (Photo: Craig Barritt/Getty Images)

How’d that happen!?

Snooki’s best bud JWOWW had the same reaction as the rest of us when she learned Snooki had a lil meatball in the oven.

MTV released the first trailer for the “Jersey Shore” girls’ upcoming spinoff called “Jerzdays,” which premieres Thursday, June 21, at 10/9c on MTV.

The premise of the show, initially, was going to be about Nicole “Snooki” Polizzi and Jennifer “JWoww” Farley moving into together and making “every night a girls’ night out.” That was until Snooki got a big surprise. Snooki drops her baby bombshell (and engagement news) to JWoww as they are house-hunting in Jersey City, shown in the just-released footage, which also includes a look at Snooki’s first ultrasound.

“How’d this happen?” a shocked JWoww asks the pint-sized party girl. “Sex,” Snooki replies. “Honestly, I didn’t even know that I could make a baby. So the fact that I can reproduce is very scary.”

Check Out the Trailer Below: