Maddie Ziegler is a dancer and actress known for starring on Dance Moms and in Sia's music videos for "Chandelier," "Elastic Dreams," "Big Girls Cry" and "Cheap Thrills." Her memoir, The Maddie Diaries, was published in 2017 and became a New York Times bestseller. Ziegler followed it up with a series of novels, 2017's The Audition and 2018's The Callback.