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1
Preheat oven to 350u00b0. Line bottoms of three greased 8-in. round baking pans with parchment; grease paper.
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2
In a small bowl, whisk the first 5 ingredients until blended. In a large bowl, cream butter, sugar and lemon zest until light and fluffy. Add eggs, one at a time, beating well after each addition. Beat in vanilla. In another bowl, whisk flour, baking powder, baking soda and salt; add to creamed mixture alternately with buttermilk mixture, beating well after each addition.
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3
Transfer batter to prepared pans. Bake until a toothpick inserted in center comes out clean, 20-24 minutes. Cool in pans 10 minutes before removing to wire racks; remove paper. Cool completely.
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4
For frosting, in a large bowl, beat butter, cream cheese and lemon zest until smooth. Gradually beat in confectioners' sugar and 1/3 cup lemonade concentrate. If necessary, refrigerate until spreadable, up to 1 hour.
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5
Place 1 cake layer on a serving plate. Brush 1 tablespoon lemonade concentrate over cake; spread with 1/2 cup frosting. Repeat layers. Top with remaining cake layer; brush remaining lemonade concentrate over top.
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6
Spread remaining frosting over top and sides of cake.
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7
Decorate with sprinkles. Refrigerate until serving.