Make an oval dome-shaped cake for the skirt of the princess dress and create the princess torso with fondant, and attach a motor to the dome to make it rotate.
Make a hidden compartment inside the cake that reveals a pop-up scene or message hidden inside the cake.
Make a pinata shell with chocolate and fill it with candies and jellies. Let the birthday person break open the cake to reveal the secret.
Make a rotating cake with different layers that showcase a different part of the dress — head, top, and skirt — and change the dresses of the characters by rotating the levels.
Hide an electronic music box in the cake and turn it on to sing the birthday jingles when it's time for cake cutting.
This cake has the base of any ordinary cake that’s covered with a plastic sheet from the sides and filled with ganache, which covers the entire cake with plastic is pulled up.