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Let's hear it for the boy! Nearly two months after welcoming son Beau Kyle Dykstra, her first child with fiance Cutter Dykstra, Jamie-Lynn Sigler is still in awe of her little bundle of joy. Now, in the new issue of Us Weekly, she's proudly showing him off for the very first time -- and opening up about how much life has changed since his birth. See the photo HERE!

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"I get how they say you will never know what love is until you have a child," the 32-year-old Sopranos alum tells Us exclusively. "It's such an overwhelming feeling of responsibility, of love, of fear, of everything."

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Overwhelming is a good word to describe her delivery, too. Sigler was in labor for 36 hours before giving birth to Beau at 3:53 p.m. on Aug. 28. He weighed in at 8 pounds, 4 ounces -- and he's growing every day.

As is his mom's love. She and her fiance, a baseball player, have settled in to a happy routine with their son, which they plan to take on the road when Dykstra's season starts up again next year.

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Engaged since January, the happy couple are planning a destination wedding in 2015. They'd also like to have another baby down the road -- but for now they're giving all their attention to Beau. "This little man needs his time!" the proud mom quips.