Bake the cupcakes according to the directions on the package.

After letting them cool, mix 1 cup of boiling water with 1 package of berry blue Jello and 1 cup of boiling water with 1 package of strawberry Jello, for 2 minutes.

After the 2 minutes, add 1/2 cup cold water to each and mix well.

Poke holes in the cupcakes and give them liquid Jello shots using a syringe. Be careful not to add too much of the Jello liquid to the cupcakes or they will end up soggy.

Place the cupcakes in the refrigerator for about 3 hours.

Remove 1/2 cup of Cool Whip from each container and place it in a bowl. Set in fridge.

Mix the remaining Cool Whip into the leftover liquid gelatin, one container for each color and place in them in the fridge to set. If the mousse isn't ready, place it in the freezer to speed it up.

Pipe the mousse on the cupcakes.

Use the Cool Whip to pipe stars on top.