Amy Poehler and Will Arnett
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Archie Arnett was born on Saturday and weighed in at 8 lbs., 1 oz., their rep Lewis Kay said in a statement.
"Amy, Will and Archie are all healthy and resting comfortably," Kay said.
During the "Weekend Update" segment of Saturday Night Live, Poehler's co-anchor Seth Meyers announced to a cheering crowd: "Amy Poehler is not here tonight because she is having a baby."
Poehler, 37, revealed in April that she and Arnett, 38, were expecting.
"I've been very lucky," Poehler told PEOPLE in July. "I’m feeling good, and I’m just overwhelmed with blessings."
Meyers recently told PEOPLE that the cast was thrilled about the baby. "We're all excited for her," said Myers. "I think she's going to be a great mom."
Besides welcoming the new member of the family, Arnett will star with Kristen Bell in the big-screen comedy When in Rome, and Poehler – who is leaving SNL this year – will return to NBC in the spring as the star of an as-yet-untitled primetime comedy.
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