You knew Kristen Wiig could play a variety of hilarious characters, but did you know she could dance? Wiig was Sia's surprise guest at the Grammy Awards this year, performing alongside pint-size dancer Maddie Ziegler while Sia sang "Chandelier." That's not an easy song to dance to, and Wiig totally nailed the complicated moves. Is it weird to say we're proud of her? We're proud of her, and we're so excited that she turned out to be the surprise guest. Take a look at the video below and if you're wondering why Sia performs with her back to the camera, we have answers.