Cinderella is the Fairy Tale of a girl who defies her evil step-mother and step-sisters to go to a ball, and falls in love with a prince with the help of a fairy godmother. It was Phoebe Halliwell's favorite fairy tale growing up. In "Happily Ever After", Phoebe is magically transformed into Cinderella.
In the story, the fairy godmother's magic turns a pumpkin into a stage coach and Cinderella gets a dress and glass slippers. She is warned that she must return by midnight because that is when the magic will end. Just before midnight, she must say goodbye to the prince, and while running off, she leaves behind one of her magic slippers.
When the Wicked Witch escaped the Magic Mirror, she first sent the glass slippers to Phoebe. When Phoebe put them on, a dress magically appeared, and the shoes forced her to walk to the street where she met up with a horse and carriage. It took her to "the ball"—a charity fundraiser hosted by media mogul Adam Prinze. Phoebe didn't know that the witch had cast a spell on Adam to trap her in the carriage when it turned into a pumpkin. When Phoebe tried to escape, she left behind a glass slipper before being thrown into the carriage, and trapped when the carriage turned back into a pumpkin. Only one slipper initially returned, but the second did after her story "reached a happy ending."