Prepare cake mix according to package instructions. Allow cupcakes to cool.
Insert an apple corer into the top of the cupcakes. Do not allow the apple corer to go through the bottom of the cupcake. Twist the corer as it is removed from the cupcake. This will form a small hole in the cupcakes. The whole for the cupcake can also be hallowed out using a measuring spoon (1/2 teaspoon measure) if an apple corer is not available.
Fill cupcakes with lemon curd using a teaspoon. Approximately 1 1/2 teaspoons.
Whip heavy cream and sugar until peaks are able to hold its shape.
Ice cupcakes with whipped cream and lemon curd (Approximately 1 tablespoon of each). Apply whipped cream first and then top with lemon curd. Use a toothpick or wood skewer to swirl lemon curd into whipped cream.