Ice smooth 2-layer cake (bake two 1 1/2 in. layers to form 3 in. high cake); ice sides at least 1/2 in. thick. Comb cake sides with Icing Sculptor, using ivory ("W"-shaped) blades. Pipe tip 1M rosettes on cake top; sprinkle with Cake Sparkles and position fondant hearts. Pipe tip 18 shell bottom border; overpipe with tip 18 zigzags.