Ever since Nashville stars and real-life sisters Lennon, 15, and Maisy Stella, 11, came onto the music scene with their unique covers of hit songs, we've been impressed. And we've loved watching them grow, as their characters on the ABC drama were not only given original song material, but more in-depth story lines.

But color us even more blown away when the two came in and gave us a live, intimate acoustic performance of Charli XCX's "Boom Clap," their version of which has amassed nearly six million views on their YouTube page.

Nashville's Maisy Stella is totally grossed out by kissing - and it's adorable

If you want to feel bad about yourself, or just listen to damn good music, sit back and click the video above!

Nashville airs Wednesdays at 10/9c on ABC. Make sure to check out Lennon and Maisy's new book In the Waves here.