Preheat the oven to 350°. Line the bottom of 3-9" cake pans with parchment paper and lightly spray with baking spray. Set aside. In a large mixing bowl combine flour, baking powder, salt and baking soda. Set aside.
In the bowl of a stand mixer fitted with a paddle attachment add sugar, butter and shortening. Beat on a high speed for 2 minutes or until light and fluffy. Add the eggs and mix for 30 seconds. Add buttermilk, sour cream, lemon juice, pink lemonade powder and vanilla and mix until combined. Next add the flour mixture to the wet ingredients and mix until just incorporated. While the mixer is on, drip the food coloring into the batter until desired color has been reached.
Evenly divide the batter into the prepared cake pans and place them in the preheated oven on the middle rack. Bake for 25 minutes or until a toothpick inserted into the middle of each cake comes out clean. Once baked, remove the cakes from the oven and place on a wire cooling rack and let cool completely.