Maxwell Drew Johnson was born in Cedars-Sinai in L.A. Tuesday morning, reps confirmed to Us Weekly.
Maxwell weighed in at 9lbs., 13 ounces.
Jessica announced the happy event on her website, writing "Eric and I are elated to announce the birth of our baby girl... We are so grateful for all the love, support and prayers we have received. This has been the greatest experience of our lives!"
Simpson and Johnson were engaged in November 2011 after just six months of dating.
Fashion mogul Jessica Simpson and fiancé Eric Johnson welcomed their first child, a girl!