Let butter and eggs stand at room temperature for 30 minutes. Preheat oven to 375 degrees F. Grease and lightly flour two 9x2-inch round baking pans; set aside.

In medium bowl combine flour, baking powder, 1/2 tsp. salt, and baking soda; set aside. In large bowl beat butter on medium 30 seconds. Gradually beat in sugar until combined; beat 2 minutes more. Add yolks one at a time, beat well after each addition. Add flour mixture and milk alternately; beat on low after each just until combined. Stir in peels and juices. Spread batter in prepared pans.

Bake for 20-25 minutes or until pick inserted near centers comes out clean. Cool in pans on racks 10 minutes. Remove from pans; cool.

Prepare Lemony Frosting. Place one layer flat side down on plate; spread top with frosting. Stack second layer flat side down; spread remaining frosting. Serve immediately or cover and refrigerate. Makes 12 servings.

Lemony Whipped Cream Frosting: In large chilled bowl beat 2 cups whipping cream, 2 Tbps. powdered sugar, and 1 Tbsp. instant vanilla pudding on medium-high until stiff peaks form. Fold in 1 Tbsp. shredded lemon peel. If made ahead, chill 24 hours; stir before spreading. Makes 3-1/2 cups.