Willie and Jeb Robertson from A&E's "Duck Dynasty" surprised folks gathered to see Jimmy Buffett perform live at Bossier City's new Margaritaville Casino by stopping by and hanging out.

Erin McCarty, who was at the show to see the legendary singer perform live for the first time in her life, managed to snap some photos of the Robertsons chatting with fans before the concert.

She also captured some video of the bearded brothers taking the stage -- and singing! -- alongside Buffett. You can check that out below.