Sia was scheduled to perform her song "Chandelier" this week on Late Night With Seth Meyers, but we also got a very special guest: Lena Dunham. The Girls master showed off her moves in a blond wig and white outfit while Sia sang (we think) facedown on a bed. (Top bunk, obviously.) Those who caught her performance on The Ellen DeGeneres Show last month know Sia prefers not to face the camera while singing, and I have to say, I'm really impressed by anyone who can sing that well while lying still on a bed. The performance is inspired by Sia's viral video for the song, and Dunham's sweet dance skills add a unique touch. Side note: there's toilet paper involved. Watch it below.