Karen Fairchild and Jimi Westbrook of Little Big Town have announced they're expecting their first child together.

The couple shared the news last night via Twitter, in a tweet which read: "Yep, it's true...excited to finally tell the news...Jimi and I are having a little one."

The quartet also includes Phillip Sweet, who became a first-time dad in 2007, and Kimberly Schlapman, who also had her first child earlier that same year. Jimi and Karen were married in 2006.

Little Big Town was among the acts performing at last night's star-studded All for the Hall benefit concert in Nashville. The group headlined their first tour earlier in 2009.