I’ve never heard of this before, but I actually really like it. It’s like when you paint your sliding barn door to your bathroom red, but then distress it to make it look like the paint has worn off. It’s called a naked wedding cake, and according to People:
The newlyweds cut into a three-tiered vanilla bean cake with vanilla buttercream and raspberry coulis from Caribou Club. The frosting was applied naked-style — meaning there was little to no icing on the sides.