Cheap Thrills singer Sia has come forward to defend her choice of casting 18-year-old Maddie Ziegler in the role of an autistic girl in her upcoming film Music. Sia, who has drawn wide backlash since the trailer for her directorial debut dropped last year, has been accused of "ableism" for not casting an autistic actor for the role. Sia defended young Ziegler who starred in the music video for her song Chandelier, saying it was "nepotism" that prompted her to make her casting choice.