The child is the second for Richie and her rocker beau Joel Madden, who are also the parents of 1-year-old Harlow Winter Kate Madden.
"In the middle of night, the very early hours of Sept. 9, 2009, Sparrow James Midnight Madden was born to Nicole Richie and Joel Madden. He weighs 7 pounds, 14 ounces. Nicole, Joel, Harlow and Sparrow are all doing well. Thank you for all of your good wishes," People.com reported the couple said in their blog posting Wednesday.