Country music singer Gretchen Wilson has officially graduated from high school after passing the GED in April.

Wilson, who dropped out in ninth grade, passed her General Educational Development exam in April and will walk across the stage during a May 15 graduation ceremony.

Wilson's first radio single, "Redneck Woman," spent five weeks at No. 1 on Billboard's Hot Country Songs chart and it earned her a 2005 Grammy. Her debut album sold 4.5 million copies.

According to reports, 20 percent of Tennesseans do not have a high school diploma.