Barbie stars as Genevieve, a princess with eleven sisters: Ashlyn, Blair, Courtney, Delia, Edeline, Fallon, Hadley, Isla, Janessa, Kathleen and Lacey. Each princess is beautiful and different, but the twelve sisters have one thing in common: they all love to Dance. They live in a castle with their widowed father, King Randolph. The girls' adventurous and free-spirited natures are viewed as "unladylike" and "unproper" by other members of the royal society and often leads them to make rude comments about the princesses. Believing his daughters need a woman's touch, the king summons his cousin, Duchess Rowena, to the castle to help raise them. But, Rowena has her own plans: she plans to poison the king and get rid of his daughters so that she can be queen.