"I'm here tonight with some of my closest friends from Oklahoma and beyond," Shelton said, "to join in and help with the rebuilding and recovery of this land that means so much to me."
Shelton's wife, Miranda Lambert, couldn't hold back tears during her performance of "The House That Built Me," filmed live from Oklahoma City.
"Sorry," she mouthed to the crowd as she struggled to contain her emotions.
"I love you, Oklahoma," she said.
According to TV Guide, celebrities like Carrie Underwood, Jimmy Fallon, Garth Brooks and Jay Leno contributed taped messages to the event, which asked viewers to donate to United Way's relief program.