"This year we decided to dress up as the heroes of our childhood", writes Taylor at the colorful photo. Thus the singer herself was dressed as Ariel the little mermaid.
Fashion model Gigi Hadid had dressed as Mary Poppins and actress Blake Lively pretended to be Dorothy The Wizard of Oz.
Also 'Steve Irwin',' Cinderella 'and'Victoria Beckham"Were guests at the party. Blakes husband, actor Ryan Reynolds, wore a gray suit.