Jamie-Lynn Sigler is a brand new mom!

The star of "The Sopranos," 32, and her fiance Cutter Dykstra, 24, welcomed son Beau Kyle Dykstra on Wednesday afternoon, according to Us Weekly.

He weighed in at 8 lb., 4 oz.

This is the first child for the couple, who announced they were engaged just two weeks before announcing Sigler's pregnancy. Jamie-Lynn and her baseball player BF been together for about a year.

According to a rep, "Both mommy and baby are great!"

Congratulations to the happy couple!

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