NEW YORK (Reuters) – Singer and fashion designer Jessica Simpson gave birth to her second child, a boy named Ace Knute, at a Los Angeles hospital on Sunday. Simpson, 32, and her fiance, former football player Eric Johnson, also have a daughter, Maxwell Drew, who was born in May 2012. "Ace Knute (pronounced Ka-nute) Johnson has arrived! Mom and baby are doing great," her representative told Us Weekly magazine. "Jessica, Eric and Maxwell are thrilled to welcome the new addition to their family. …