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Madison Nicole Ziegler is an American actress and dancer. She appeared in Lifetime's reality show Dance Moms, from 2011 until 2016, and starred in a series of music videos by Sia, beginning with "Chandelier" and "Elastic Heart", which have in total attracted more than 6 billion views on YouTube. Ziegler has appeared in films, television shows, concerts, advertisements and on magazine covers. 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. Her film roles include Camille Le Haut in the animated film Ballerina (2016), Christina Sickleman in The Book of Henry (2017), the title role in Music (2021), Mia in the high school drama The Fallout (2021), Velma in Steven Spielberg's 2021 West Side Story and Lindy in Fitting In (2023). Ziegler was included by Time magazine on its list of the "30 most influential teens" in each year from 2015 to 2017. She was included in the 2023 Forbes 30 Under 30 list in the Hollywood & Entertainment category. Her social media presence includes an Instagram account with more than 13 million followers.