Forget “T-shirt Time”… It’s actually “onesie time” at Nicole “Snooki” Polizzi’s home…

The 24-year-old Chilean-born Jersey Shore star gave birth to her first child on early Sunday morning, shortly before 3:00 am at Saint Barnabas Medical Center in Livingston, New Jersey.

“The world just got another Guido!!! Lorenzo Dominic LaValle has entered the world weighing 6 lbs, 5 oz. Nicole, Jionni & Enzo are doing great!” reports MTV about the new mom, who went into labor on Saturday night.

On Sunday, Polizzi even Tweeted about already appreciating the feeling of being a parent.

“Being a mom is an amazing feeling!!! I love my little man to death! Jionni is such a cute dad,” she wrote. “I am SO IN LOVE with my son Lorenzo Dominic.”

News that Polizzi and her fiancé Jionni LaValle were expecting was announced in March. In May, Polizzi revealed she would be giving birth to a boy.

Impending motherhood seemed to mellow the reality star, who slowed down her fast-paced lifestyle after learning she was pregnant.

“I guess [pregnancy] just made me more mature,” the Snooki & JWOWW star told reporters in April. “It’s different because now I’m not drinking. I’m usually partying and going to clubs, but pregnancy made me grow up a lot.”