Cutter Dykstra and Jamie-Lynn Sigler Welcome Son Beau Kyle

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Jamie-Lynn Sigler is officially a girl with a kid.

The former Guys with Kids and Sopranos star, 32, and her fiancé Cutter Dykstra welcomed their first child on Wednesday, Aug. 28, a source tells PEOPLE.

Son Beau Kyle Dykstra weighed in at 8 lbs., 4 oz.

“Thank you for all the love! Cutter and I feel so blessed and appreciative of everyone’s well wishes,” Sigler Tweeted Thursday. “So madly in love with our BOY!”

After announcing their engagement in January, the couple surprised fans with even more exciting news only two weeks later: they were expecting! While confirming they would welcome a son, Sigler admitted she was even shocked by the timing of it all.

“We definitely thought it was going to be a slow relationship process and possibly an engagement — I felt like it was coming — so the baby definitely threw us for a loop,” the actress said in April.

Despite denouncing heels for the remainder of her pregnancy, Sigler sported a pair for her June baby shower, where she told PEOPLE she and Dykstra, 24, were having trouble deciding on their son’s name.

“We have a couple of [baby] names we’re toying with. We’ll call him one name one week and one name another week. I think we have our favorite, but you never know. We could change our minds when we meet him,” she said at the time.

— Anya Leon with reporting by Aili Nahas