Jennifer Nettles\' manager says the U.S. country singer is pregnant with her first child. The star of TV\'s \"Duets\" married entrepreneur Justin Miller in November in Nashville. They began dating in 2006. \"They are thrilled beyond belief,\" Nettles\' manager Gail Gellman told People.com Monday. Gellman said the 37-year-old Sugarland singer is due in November.