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The \"Minimum Wage\" crooner further enticed prospective patrons to show up by joking, \"I repeat it's only a rehearsal… It may not be good but at least it's free!\"

In the hours leading up to the free performance, the Ole Red account shared a video of a line full of smiling fans forming outside of the establishment.

Of course, the smiles on their faces grew even wider when Shelton told them his bride would be joining him for the free show -- marking their first public appearance since the two tied the knot.

During the rehearsal, Stefani belted out her No Doubt hit \"Don't Speak\" as Shelton backed her up on guitar. The two also performed their country duets \"Happy Anywhere\" and \"Nobody But You.\"

Shelton is set to kick off his \"Friends and Heroes\" Tour alongside Martina McBride, Tracy Byrd and Trace Adkins on Aug. 18. Their first stop is at Nebraska's CHI Health Center Omaha convention center.

View this post on Instagram

A post shared by Blake Shelton (@blakeshelton)

As for Stefani, she's set to kick off a Vegas residency at Zappos Theater in October.

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