"My husband and I welcomed our beautiful, healthy baby boy to this world this morning! Biggest joy of my life!!! love my kid.
"PS and his name is...Sebastian Zincone. Love him more than life itself!!," she posted on her Twitter page.
The Swedish-Canadian star, 34, and The Petalstones drummer, who wed in June 2007, announced in September that they were expecting their first child, reported Us magazine.
"He's so excited. So excited. We've been together long enough, we've talked about it enough that it just feels really right and we can't wait," Akerman had said.