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."
That's not all, though! Last month, Lily gushed to Billboard, "She's incredible, and she has such a presence...Her personality is what shines through."
"I'm not close to Miley," she said. "I don't know her very well, but I feel proud of her."
"It must have been very tough for her to make that transition from the Disney star of Hannah Montana into herself, essentially," she acknowledged. "People don't really like change in this day and age, and not only has she succeeded in changing her complete persona, but she's done it in an in-your-face way, which I love. I'm all for that kind of stuff."
Gotta love a good girl crush.