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Carrie Underwood is the latest star to sign on for Toby Keith's Oklahoma Twister Relief Concert.  But the singer won't be there in person.  Since Carrie was already committed to performing on the Grand Ole Opry on the night of the show, she'll be appearing via satellite from Nashville's Grand Ole Opry House. 

Underwood is joining a lineup that also features Garth Brooks, Willie Nelson, Ronnie Dunn, and Trisha Yearwood, as well as John Anderson, Mel Tillis, and Sammy Hagar - who will all be in Norman, Oklahoma for the show. 

Keith's sold-out Oklahoma Twister Relief Concert will take place at the University of Oklahoma's Gaylord Family - Oklahoma Memorial Stadium on July 6th.  The event is supporting The United Way Of Central Oklahoma May Tornado Relief Fund. 

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