Joe Don Rooney

DeMarcus says he's 'really, really, really proud' of Rooney -- though there's still a long way to go before a potential Rascal Flatts reunion.

New details are emerging about the Rascal Flatts guitarist's complicated split from his wife.

Dads are the best: They'll take you fishing, teach you important life lessons ... and occasionally act pretty goofy.

Fallon and Rooney met thanks to the latter's Rascal Flatts bandmate, Jay DeMarcus.