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Actresses Tina Fey and Amy Poehler (r) attend the world premiere for their film "Baby Mama" which was part of the opening night festivities for the Tribeca Film Festival held in New York on April 23, 2008. (UPI Photo/Ezio Petersen)

Poehler's publicist, Lewis Kay, told People that Poehler and her husband, comedian Will Arnett, will become parents in late autumn.

Poehler, 36, and Arnett, 37, were married in 2003. This will be their first child.

"Baby Mama," starring Poehler and Tina Fey, was the No. 1 U.S. box-office draw this weekend. Arnett is in Rome filming, "When in Rome," a comedy also starring Kristen Bell.