Two worlds collide, when the modern aristocrat, Princess Courtney, and the famous rock star, Erika Juno, accidentally switch places with each other. Now, by an unintentional mix-up, the beautiful noblewoman arrives in Camp Pop, while the talented singer finds herself all alone in Camp Royalty. Little by little, as both rival camps attempt to remedy this awkward situation, the girls try their best to adjust, making unforeseen and exciting new friendships. Will the Princess and the Rock Star embrace their differences to shine at this summer's grand singing competition?Get ready to rock! In this upbeat musical, Barbie stars as Courtney, a princess whose world is turned upside down when she switches places with Erika, a famous rockstar.