Preheat oven to 350.
In using pineapple rings, cut them into quarters.
Spray muffin pan with non stick spray.
Combine cake mix, oil, eggs and pineapple juice in a bowl and beat on low until incorporated.
In another bowl combine melted butter and brown sugar and stir until blended.
Spoon 2 teaspoons of butter mixture into each cup.
Place pineapple pieces in a cirle around bottom with cherry in center.
Fill each cup 2/3 full with batter.
Bake 20-25 minutes or until toothpick inserted in center comes out clean.
Allow to cool in pan for 5 minutes.
Run a butter knife around edges of each cup and invert onto baking sheet to remove cupcakes.