Rascal Flatts guitarist Joe Don Rooney and his wife, Tiffany Fallon, welcomed their third child, a baby girl, on Sept. 29 Credit: Christopher Polk/Getty Images for Wonderwall

Welcome to the world, little rascal! Joe Don Rooney — the guitarist for country super-group Rascal Flatts — has welcomed his third child, a baby girl, with wife Tiffany Fallon, his rep confirms to Us Weekly.

The newborn, whom the couple named Devon Olivia, joins big brother Jagger Donovan, 6, and sister Raquel Blue, 4. She arrived on Monday, Sept. 29, at 7:01 p.m. in Nashville, Tenn., and weighed 6 pounds, 11 ounces at birth.

The country star and his wife — second runner-up to Miss USA 2001 — have been married since April 2006. They announced they were expecting again earlier this year.

"We are so thrilled and feel so blessed to bring another little angel into our world," Rooney told Us at the time. "Jagger and Rocky are very excited, too. They're going to make a great 'big brother - big sister duo' as the Rooney circus continues."