Watch Barbie and the Diamond Castle (2008) full movie online.
Synopsis: In this animated movie, Barbie wants to teach her little sister, Stacie , the true value of friendship. So she and her best friend, Teresa, weave a music-infused fairy tale about Liana and Alexa, two peasant girls who have little else but each other and their love of song. When a magic mirror reveals an evil plan to destroy the Diamond Castle and end all music worldwide, Liana and Alexa bravely set out to save the day.
Director: Gino Nichele
Writers: Elana Lesser, Cliff Ruby
Stars: Kelly Sheridan, Melissa Lyons, Cassidy Ladden
More info: IMDB