A new little chick will be joining the Dixie Chicks this fall. People reports that Emily Robison is pregnant with her fourth child. The multi-instrumentalist is expecting in September.

A rep tells People that Robison and boyfriend Martin Strayer are very excited. The new babe will join Robison's 7-year-old twins Juliana Tex and Henry Benjamin, as well as 9-and-a-half-year-old Charles Augustus. All three of those kids were with her ex-husband Charlie Robison, whom she divorced in 2008.

The new baby, whose gender hasn't been revealed, will be the ninth to join the Dixie Chicks family. Singer Natalie Maines has two sons, and Martie Maguire has three daughters.

Last year, Robison said she was hoping for a Dixie Chicks reunion soon, but there has been no indication that one is being planned. She and Maguire also formed a duo called Courtyard Hounds, and released one album in 2010.