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Blake Shelton fans might've thought it was a bit odd when he started singing the Jason Aldean-Kelly Clarkson duet "Don't You Wanna Stay" at Blake's show Thursday night (Jan. 13).
But then Blake's new BFF Kelly Clarkson walked out onto the stage  and started singing with him. Mystery solved.
Blake's fans in Toledo, Ohio, went pretty nuts when Kelly walked out. And the fans sang nearly as loudly as Blake and Kelly did.
"Thank you @kelly_clarkson for singing with me tonight!!!! I. LOVE. YOU!!!!!!!!" Blake tweeted after the show.
And it looks like Kelly stuck around for the rest of the show—and enjoyed it.
"I got to see @blakeshelton show tonight and wow so great!! Y'all have to go see it!! Fun night!!" she tweeted.