Pop star Jessica Simpson is a new mum after giving birth to a baby boy. The Irresistible hitmaker and her fiance Eric Johnson welcomed Ace Knute, a little brother for their daughter Maxwell Drew, in Los Angeles on Sunday (30Jun13). Her representative tells UsMagazine.com, "Ace Knute Johnson has arrived! Mum and baby are doing great. Jessica, Eric and Maxwell are thrilled to welcome the new addition to their family." The boy's middle name is a nod to his paternal grandfather, Knute Johnson. Simpson confirmed her second pregnancy in November (12), just seven months after becoming a first-time mother.