Bake two 6" round cakes according to package directions, or from scratch if you prefer. Make sure to grease and flour the pan before baking.
Allow cakes to cool, then stack one on top of the other with a layer of buttercream frosting in between.
Spread an even coat of buttercream frosting over the top and sides of the cakes.
Use your Cricut or scissors to cut a pattern for the emoji's face. We imported an emoji image into Cricut Design Space and sized it to 6," then cut it from cardstock.
Roll out your red fondant on top of wax paper sprinkled with confectioner's sugar. Use the heart pattern as a guide and cut two hearts from the rolled fondant.
Repeat the previous step using black fondant and the smile.
Roll our a large piece of yellow fondant to cover the cake. Gently use the rolling pin to help drape it over the cake, then smooth it with your hands or a smoothing tool. Trim the excess.
Attach the eyes and smile.