Drea de Matteo, Shooter Jennings Welcome a Son

By Sarah Michaud

Friday April 08, 2011 01:25 PM EDT

Drea de Matteo and Shooter Jennings

John Shearer/WireImage

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It's a boy for Drea de Matteo and Shooter Jennings.

"Waylon Albert 'Blackjack' Jennings has arrived," Jennings, 31, Tweeted Thursday. "Thanks for all the kind words folks! We're super lucky to have so many kind friends!"

Baby Blackjack joins big sister Alabama Gypsyrose, 3, and carries on his father and country crooner grandfather Waylon Jennings's first name.

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Jennings and Sopranos alum de Matteo, 39, have been together for nine years and got engaged on stage in New York in June 2009.