"Praise the Lord Quincy is here!" Fields tweeted Tuesday. "8 lbs. 8 oz. 20 inches long we are all doing great thank you for your love prayers and support!"
"We are so blessed and grateful to God for this newest gift to our family," the couple said in a statement.
Fields married the 37-year-old Morgan, a Broadway actor, back in 2007. She gave birth to Sebastian Alexander, now 6, shortly afterward.
Fields said in a previous tweet that the two brothers had already become friends.
Q is playing with his big brother, whenever he hears Sebastian's voice he moves all around and Sebastian loves it!#brotherlylove— Kim Fields (@KimVFields) October 6, 2013