The couple named their newborn son Sparrow James Midnight Madden.
Richie says on her Web site that the 7 pound, 14 ounce baby boy was born early Wednesday. Sparrow is the second child for Richie and Madden. Their daughter, Harlow, will be 2 in January.
Richie, 27, became a clothing and accessories designer after starring with Paris Hilton on "The Simple Life." Madden, 30, fronts the band Good Charlotte and runs the DCMA Collective clothing line with his twin brother, Benji.