The duo performed Miranda's smash "Little Red Wagon" and owned. Of course, T-Swift's fans went nuts over their performance.
They weren't the only ones. The "Wildest Dreams" crooner shared clips and pictures of their duet on her Instagram Wednesday evening, giving fans who couldn't attend the concert an inside look at the powerhouse performance.
The first clip shows Mir taking the stage with Tay Tay joining her soon after. "YOU CAN'T RIDE IN MY LITTLE RED WAGON," Taylor captioned her video.
Her second clip shows the stars rocking out together, front and center. "Oooooh Ahhhhhhh," Taylor captioned it.
She also shared a black-and-white photo of their duet. "'And you're just trying to slow this rolling stone but I'm onto you babe....' @mirandalambert," she wrote.
How cool of a surprise is that one? Those two are the queens of kick-ass girls. But let's be real...wouldn't her bae Calvin Harris would be an epic AF tour guest...? Get on that, Tay!