Husband-and-wife singers Blake Shelton (right) and Miranda Lambert perform an acoustic version of the hit "Over You" during a broadcast of the singing competition series "The Voice" in Los Angeles on Tuesday, May 21, 2013. Mr. Shelton, an Oklahoma native, and NBC are putting together a benefit for tornado victims in his home state. (AP Photo/NBC, Trae Patton)
Husband-and-wife singers Blake Shelton (right) and Miranda Lambert perform an acoustic version of the hit "Over You" during a broadcast of the singing competition series "The Voice" in Los Angeles on Tuesday, May 21, 2013. Mr. Shelton, an Oklahoma native, and NBC are putting together a benefit for tornado victims in his home state. (AP Photo/NBC, Trae Patton)
Blake Shelton accepts the award for entertainer of the year at the 46th Annual Country Music Awards at the Bridgestone Arena on Thursday, Nov. 1, 2012, in Nashville, Tenn. (Photo by Wade Payne/Invision/AP)
Blake Shelton accepts the award for entertainer of the year at the 46th Annual Country Music Awards at the Bridgestone Arena on Thursday, Nov. 1, 2012, in Nashville, Tenn. (Photo by Wade Payne/Invision/AP)
Blake Shelton, left, and Keith Urban perform during a tribute to Willie Nelson at the 46th Annual Country Music Awards at the Bridgestone Arena on Thursday, Nov. 1, 2012, in Nashville, Tenn. (Photo by Wade Payne/Invision/AP)
Blake Shelton, left, hands a guitar to Lifetime Achievement recipient Willie Nelson at the 46th Annual Country Music Awards at the Bridgestone Arena on Thursday, Nov. 1, 2012, in Nashville, Tenn. (Photo by Wade Payne/Invision/AP)
Artists, from left, from left, Dave Haywood, Hillary Scott, Charles Kelley, Blake Shelton, Willie Nelson, Faith Hill and Tim McGraw perform during a tribute to Willie Nelson at the 46th Annual Country Music Awards at the Bridgestone Arena on Thursday, Nov. 1, 2012, in Nashville, Tenn. (Photo by Wade Payne/Invision/AP)
Artists, from left, Dave Haywood, Hillary Scott, Charles Kelley and Blake Shelton perform during a tribute to Willie Nelson at the 46th Annual Country Music Awards at the Bridgestone Arena on Thursday, Nov. 1, 2012, in Nashville, Tenn. (Photo by Wade Payne/Invision/AP)
Miranda Lambert, winner of the awards for song of the year for "Over You" and female vocalist of the year, left, and Blake Shelton, winner of the awards for male vocalist of the year, song of the year for "Over You" and entertainer of the year, pose backstage at the 46th Annual Country Music Awards at the Bridgestone Arena on Thursday, Nov. 1, 2012, in Nashville, Tenn. (Photo by Chris Pizzello/Invision/AP)
