Heat oven to 350 degrees Fahrenheit and grease one 8-inch square pan and one 8-inch round pan.
Beat butter and sugar until creamy, then beat in egg whites, cherry juice, and almond extract.
Stir in cake flour, baking powder, salt, and buttermilk alternately until smooth.
Divide batter between the two pans and bake for 30 minutes until clean tester emerges.
Cool cakes, cut round cake in half, and place halves against adjacent sides of square to form a heart.
Frost entire heart shape with almond buttercream and pipe decorative shells along borders.