Watch out for a familiar looking face opening up before Cole Swindell Sunday night! Dierks Bentley is a master of disguise. The star served as his own opening act at a show in West Palm, Fla., on June 17, and no one — okay, very few people — recognized him.Bentley and the Bolo Boys Bluegrass Band played a surprise set two hours before Bentley’s headlining set on Saturday. The crowd didn’t seem to realize that the Bolo Boys were actually Bentley and his bandmates in costume.In a clip from a fan uploaded to Facebook, Bentley is seen over-sized dress shirt, blue jeans, a cowboy hat and sunglasses.