Fergie is a proud mother. A representative for the singer says she gave birth to 7-pound, 10-ounce Axl Jack Duhamel on Thursday. Axl Jack is Fergie and actor Josh Duhamel’s first child. The 38-year-old singer married the 40-year-old actor in 2009. She officially changed her name from Stacy Ann Ferguson to Fergie Duhamel this month. Fergie is one-fourth of the Black Eyed Peas. She released her solo debut, ‘‘The Dutchess,’’ in 2006.