June 28, 2012 04:45 PM

Mark Sullivan/WireImage

A new little chick is on the way!

Emily Robison is expecting her fourth child, a rep for the musician confirms.

“She’s excited!” the rep tells PEOPLE, adding that the baby is due in early September.

This will be the Dixie Chicks and Court Yard Hounds singer’s first child with boyfriend Martin Strayer; Robison, 39, is also mom to twins Juliana Tex and Henry Benjamin, 7, and son Charles Augustus, 9½, with ex-husband Charlie Robison.

Bandmates Natalie Maines and Martie Maguire are mothers as well; Maines has two sons while Maguire has three daughters.

— Sarah Michaud with reporting by Anya Leon

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