<P> Madison Nicole Ziegler (born September 30, 2002), better known as Maddie Ziegler, is an American dancer, actress and model . She first became known for appearing in Lifetime's reality show Dance Moms from 2011 (at age 8) until 2016 . From 2014 to 2016, she gained wider fame for starring in five music videos by Sia, including "Chandelier" and "Elastic Heart", which cumulatively have attracted more than 3.4 billion views on YouTube . Ziegler has appeared in films, television and concerts, and has modeled on magazine covers and in advertisements for Capezio, Ralph Lauren and Target, among other brands . She was included by Time magazine on its list of the "30 most influential teens" in each of 2015 and 2016 . </P> <P> Ziegler was a judge on the 2016 season of So You Think You Can Dance: The Next Generation, toured with Sia in North America in 2016 and 2017 and toured in Australia with her sister in 2017 . Her 2017 memoir, The Maddie Diaries, was a New York Times Best Seller . She appeared in the animated film Ballerina (2016) and made her feature film debut in The Book of Henry (2017). Her social media presence includes an Instagram account with more than 10 million followers . </P>

How old is the girl in sia music video
find me the text answering this question