Banks announced the happy news on her website Wednesday, in a frank but hilarious post.
She wrote, "As 2012 winds down and Thanksgiving approaches, I have much for which to be thankful — personal, professional, and Presidential. However, nothing can match the joy and excitement my husband and I felt when we recently welcomed our second baby boy."
Banks and her husband, Max Handelman, welcomed Magnus Mitchell Handelman into their growing family. Like their older son — Felix, who is 20 months old — Magnus was born via gestational carrier.
The actress goes into a bit more detail about the process, stating, "This experience has exceeded all expectations, taught us a great deal about generosity and gratitude, and established a relationship that will last a lifetime."
The 38-year-old has been quite open about her fertility issues, explaining to Lucky magazine earlier this year that "It was a womb issue for me. Embryos wouldn't implant."
It certainly will be a joyful holiday season for the 30 Rock guest star, but like any mom, she knows what lies in store for her.
Banks joked, "I now turn my attention to managing two boys under two. For which I am thankful. And all their poop. For which I am less thankful. Wish me luck."
Best of luck to the Handelman family and all of their dirty diapers.
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