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Trim off rounded tops from 8-inch cakes. On serving plate, place 1 round cake layer, cut side down. Spread with 1/3 cup frosting. Top with second round cake layer, cut side down. Trim off rounded top of custard-cup cake to make flat surface. With small amount of frosting, attach custard-cup cake, flat side down, to top of layer cake, lining up rounded edge with layer cake edge. Using doll as a guide, cut and remove rounded piece from custard-cup cake to make seat for doll. (Discard cut-out piece.)