Underwood tweeted her fans after the show, "Just got to rock the stage with @OfficialTFK in Tulsa! So much fun! Thanks, guys for letting me crash your party!"

Underwood took the stage to join the band in a performance of their song "Let The Sparks Fly." You can see fan filmed footage here and here. The track comes from the Thousand Foot Krutch's Hard Rock chart topping album "The End Is Where We Begin."