It's no secret that Ellen DeGeneres goes all out for Halloween [1], and this year's special episode of her daytime talk show was nothing short of amazing. In addition to nailing her Sia costume, Ellen teamed up with model Heidi Klum [2] (who was dressed as Sia's frequent collaborator, Maddie Ziegler [3]), and the two gave a rousing performance of the singer's hit "Chandelier," complete with a re-creation of the video's living room set. While addressing the audience, Ellen said, "As you can tell, I'm Sia and the problem is I can't really see-ya," adding, "We rehearsed for over seven minutes so this should be good." Scroll through to see all the photos of Ellen and Heidi's perfect costumes and watch their "Chandelier" rendition.