Rascal Flatts member Jay DeMarcus couldn't wait to share the breaking news with fans at the event.
He took to the stage and said, "We came here to celebrate for two reasons tonight. One, Rascal Flatts is celebrating 10 years this year, and it's been an incredible ride... And two, that S.O.B. Osama bin Laden."
"I think I speak for all of us when I say, sincerely from the bottom of my heart, Osama Bin Laden, we hope you rest in pieces."
The Al Qaeda leader was shot dead during a special CIA operation on Sunday, May 1.
Rocker Leon Russell took a more subtle approach at the festival after hearing the Bin Laden news during his Sunday night set. He simply sang the hymn "Amazing Grace".