"Anna Faris and Chris Pratt are happy to announce the birth of their beautiful baby boy Jack," their rep said in a statement.
"He arrived earlier than expected and will be spending some time in the NCIU. The happy parents thank you for your warm wishes and ask that you honor their privacy during this time," their rep continued.
Pratt -- who stars on TV's Parks and Recreation -- married Faris in 2009.
She has appeared in several movies. Including The House Bunny and The Dictator.
This is the couple's first child.