The new addition to the rascal family will join siblings Raquel Blue, who is three-and-half-years-old and Jagger Donovan, who is five-and-half.
Joe Don Rooney, Rascal Flatts' guitarist, and his wife Tiffany Fallon have a third child on the way, expected in late summer according to their rep.
Joe Don and Tiffany told People magazine, "We are so thrilled and feel so blessed to bring another little angel into our world. Jagger and Rocky are very excited, too. They're going to make a great 'big brother-big sister duo' as the Rooney circus continues."