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Blake Shelton's been tapping wife Miranda Lambert to help him promote his latest single.  He made a special guest appearance during Miranda's show in Dayton, Ohio Friday night, and they were captured on YouTube singing his new hit "Sure Be Cool If You Did" together. 

At the end of the song Miranda told the crowd that Blake had come out with her for the weekend, and the two reprised the performance at Lambert's show in Huntington, West Virginia. 

Miranda is currently on the co-headlining "Locked and Reloaded" tour with Dierks Bentley.  Their next stop will be in Ames, Iowa on Thursday. 

"Sure Be Cool If You Did" is the lead-off single from Shelton's upcoming album Based On A True Story..., which will hit stores March 26th. 

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