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.

"Elastic Heart" is a song written by Australian singer Sia, featuring Canadian singer the Weeknd and American record producer Diplo, for the soundtrack of The Hunger Games: Catching Fire, a film based on the novel of the same name by Suzanne Collins. Andrew Swanson assisted the artists in writing the song, with production handled by Diplo and US producer Greg Kurstin. It was released on 1 October 2013 as a single from Catching Fire by RCA, Republic and Lionsgate. "Elastic Heart" peaked at number 7 on the singles chart of New Zealand and was certified gold by the Recorded Music NZ. It also appeared on the charts of Australia, Belgium, Switzerland and the United Kingdom.