Lemonade Layer Cake

I made this for our annual back to school celebration. It was the perfect cake for our theme, and was delicious!

Lemonade Layer Cake
1 1/3 cups sugar
6 TB butter, softened
zest of one lemon
3 TB thawed lemonade concentrate
2 tsp vanilla
2 eggs
2 egg whites
2 cups flour
1 tsp baking powder
1/2 tsp baking soda
1/2 tsp salt
1 1/4 cups buttermilk

Place sugar, butter, zest, lemonade and vanilla in a mixer and mix until well blended. Add eggs and egg whites one at a time, beating well after each addition. In a separate bowl, mixed together dry ingredients. Add dry ingredients to batter, alternating with buttermilk, until all dry ingredients and buttermilk are well blended. Pour into two well greased 8 or 9 inch round pans. Bake at 350 degrees for 18 to 20 minutes. Cool in pans for 10 minutes, then remove to a cooling rack.

Frosting:
2 TB butter, softened
zest of one lemon
2 TB thawed lemonade concentrate
1/2 tsp. vanilla
* I added 1 tsp. Lemon extract because I LOVE extra lemony flavor!
1 (8 oz) package cream cheese, softened
3 1/2 cups powdered sugar

Mix together all ingredients except powdered sugar and blend well. Gradually add powdered sugar and beat at low speed until blended. Don't over beat. Frost cake.