Madison Nicole Ziegler (ZIG-lər) is an American dancer, actress, author and model. She was initially known for appearing in Lifetime's reality show Dance Moms from 2011 (at age 8) until 2016. Since 2014, she has gained recognition for starring in a series of music videos by Sia, beginning with "Chandelier" and "Elastic Heart", which have in total attracted more than 5 billion views on YouTube. Ziegler has appeared in films, television shows, concerts, advertisements and on magazine covers. She was included by Time magazine on its list of the "30 most influential teens" in each of 2015, 2016 and 2017. Ziegler was a judge on the 2016 season of So You Think You Can Dance: The Next Generation, toured with Sia in North America and Australia in 2016 and 2017 and has given dance tours with her sister, Mackenzie. Her 2017 memoir, The Maddie Diaries, was a New York Times Best Seller. She voiced the character Camille Le Haut in the animated film Ballerina (2016), appeared as Christina Sickleman in The Book of Henry (2017) and played the title role in the film Music (2021). Her social media presence includes an Instagram account with more than 13 million followers.