NEW YORK -- Amy Poehler isn't just acting like a "BabyMama" anymore, she's pregnant in real life.

Her publicist said she's expecting her first child with husbandWill Arnett.

The baby is due sometime this fall.

Poehler is 36 and Arnett is 38. The couple has been marriedsince 2003.

Poehler's co-star in "Baby Mama" is already a mom. Tina Fey, 37, had a baby girl with her husband in 2005.

In "Baby Mama," Poehler plays the offbeat surrogate mom for Fey's character.

Poehler is also a cast member on "Saturday Night Live" and co-starred with former "SNL" cast member Fey in "Mean Girls."