Cierra Hemmings. Luke Hemmings' twin sister, she was nothing special. She just watched in envy as her brother lived his dream with his three bestfriends. Ashton Irwin. His dream came true with his bestfriends, they were finally making it in the music industry. But Luke made one thing clear when he introduced them to his sister. Cierra was 'off-limits'. But all rules are meant to be broken, right?