Emily Robison performs at the Austin City Limits Music Festival on September 17, 2011 in Austin, Texas. Credit: Tim Mosenfelder/Getty

Emily Robison's brood has gotten bigger!

The Dixie Chick, 40, welcomed a daughter, Violet Isabel, early Tuesday morning with boyfriend Martin Strayer, her rep tells Us Weekly.

"Emily Robison and Martin Strayer are ecstatic to announce the birth of their new baby girl," her rep shared in a statement Tuesday afternoon. "Violet was born at 3:01 am on September 4, weighing 8.5 lbs. Mom and baby Violet are doing well and Dad couldn't be happier!"

Little Violet is Robison's fourth child; she joins older siblings Juliana Tex and Henry Benjamin, 7, and son Charles Augustus, 9, Robison's kids with ex-husband Charlie Robison.