Axl Jack Duhamel weighed 7 lb and 10 ounces (3.5 kg), Duhamel spokeswoman Ruth Bernstein said.
It is the first child for both Fergie, who recently changed her first name from Stacy to her stage name, and Duhamel.
Fergie, 38, rose to prominence when her addition to the Black Eyed Peas lineup coincided with a string of breakout hits for the group from their 2003 album “Elephunk.”
Her 2006 solo album, “The Dutchess,” scored three No. 1 hits in the United States.
Duhamel, 40, is best known for his roles in the “Transformers” film franchise and romantic comedies “Safe Haven” and “New Year’s Eve.”
The couple married in 2009.