By peoplestaff225
Updated March 17, 2010 12:35 PM
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Amy Poehler and Will Arnett are giving 16-month-old son Archie a sibling!

A rep for the Parks and Recreation star confirms to PEOPLE that Poehler, 38, is pregnant with her second child. Further information, including a due date, has not been released.

Archie will be turning two around the time the new baby arrives — how can this funny pair help him adjust to big brotherhood?