This book is "Barbie of Swan Lake, A Tale of Enchantment".

On the back of the book is says, "Barbie stars as Odette, a beautiful young woman who's been enchanted by an evil wizard. By day she must take the form of a graceful swan-only by night can she resume her natural shape and try to find a way to break the wizard's spell. Girls will be delighted with this charming version of the beloved ballet that comes with sticker jewel earrings they can wear as they read the story."

Note: the dissapointing part of buying the book, is the sticker earrings don't stay on.