1. Line a muffin tin and preheat oven to 350 degrees F.
2. In the bowl of your stand mixer with paddle attachment, beat together cake mix and club soda.
3. Divide the batter evenly between each cupcake holder and bake for about 18-20 minutes, or until the cake tester comes clean.
4. Let the cupcakes cool completely before decorating.

Decorating Princess Cupcakes:

1. Prepare piping bags and fill each with frosting. I used chocolate, strawberry and marshmallow for the base, then green frosting and lemon cream frosting for decorating.
2. For the theme of each princess, I used the coordinating colors and Disney Princess cake toppers.
3. For Ariel: I piped the strawberry frosting over the entire cupcake using a petal tip. Then, with a closed star tip, I iced green seashells, topping each shell with a pearl sprinkle.
4. For Tiana: I piped the chocolate frosting over the entire cupcake again using the petal tip. I used the round tip to ice green frosting in the center to create a bed of pearls.
5. For Belle & Aurora: I piped strawberry frosting over the cupcakes with a petal tip. With a star tip, I iced the lemon cream frosting all around to create flowers. Garnish with pearl sprinkles.
6. For Cinderella: I iced each cupcake with the marshmallow cream frosting, then sprinkled with blue sprinkles and pearls.
7. Top each cupcake with the princess cake toppers, and store in the refrigerator until ready to serve.