Maddie Ziegler, the young dancer who often appears in Sia's music videos, has landed a new role as a judge on U.S. reality show So You Think You Can Dance: The Next Generation. At 13, she will become the series' youngest judge ever, sitting on the panel of season 13 alongside returning stars Nigel Lythgoe, Paula Abdul, and Jason Derulo. The show will premiere in May (16).