Dixie Chicks star Emily Robison is expecting her fourth child. The baby is due in September.
 
"She's excited!" her representative told People.com.
 
The baby will be her first with boyfriend Martin Strayer. Robison, 39, has seven-year-old twins, Juliana and Henry, and a nine-year-old son, Charles, from her marriage to Charlie Robison. The former couple divorced in 2008 after nine years of marriage.