NBC announced on Wednesday that Jennifer Lopez will join its new series "World of Dance" as one of its judges. Lopez is already executive producer of the show, which showcases young dancers hoping to make their big break. Lopez said, ?I identify with the struggles, passion, discipline, competition and exhilaration of dance." The show will host competitions in a wide range of dance styles, from hip-hop, krumping, popping and locking to tap and ballet.