This doll was based on the movie Barbie: Princess Charm School and was released in 2011. It is now discontinued. The reason it she is called a 'rock star princess' is because originally she was going to be Blair's musical friend, before a major script change, as the dolls are produced very early.
Barbie™ Princess Charm School Delancy® and HADLEY® Dolls: From the new movie, Barbie™ Princess Charm School, the friends of Princess Blair™, Hadley™, a soccer ace, and Delancy™, a fun rocker, each have their own unique princess personality. These royals rule the school! Delancy® doll is dressed in purple with rockin' platform heels, statement necklace and matching evening bag. Hadley® doll is dressed in turquoise with sporty heels and a soccer ball purse. Includes doll and accessory. Doll cannot stand alone. Each sold separately, subject to availability. For ages 3 and over