The British singer, 29, performed a rendition of her single "Not Fair" alongside Miley, 21, at Thursday night's Bangerz show in Nashville. The ladies didn't just sing, though—they twerked up a storm, too!
At one point, Lily, who showed off her toned abs in a crop top, twerked right on up against the former Disney star. She Instagrammed a video of the moment, writing, "#thankyou #notfair #bangerz #sheezus."
Lily, who is joining Miley's Bangerz tour for seven performances this month, has been an outspoken fan of hers for a while. In an interview last November with The Guardian, the married mother of two called Miley "a bitch, rising" (that's a compliment, boos!) and described the twerking superstar as "my hero."