Blake Shelton and Gwen Stefani are very much out in public following their recent wedding ... playing music together at a venue in a small town in Blake's neck of the woods.
The newlyweds grabbed a couple microphones and guitars Thursday for a free concert at Ole Red -- a bar Blake owns in Tishomingo, OK ... and they were up close and personal with the bar patrons in a super intimate setting.
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Blake told the crowd he can't believe Gwen's singing in this little outpost in his home state ... and everyone got a front-row view to her new wedding ring.
Blake's rehearsing for a couple shows he's got coming up ... and his new wife is naturally helping him prepare.
TMZ broke the story ... Blake and Gwen got a marriage license in Oklahoma leading up to July 4 weekend, and they ended up getting hitched at his ranch in a small ceremony surrounded by close friends and family.