Preheat the oven to 350 F. Spray a 10 cup bundt pan heavily with baking spray.
In the bowl of a hand or stand mixer fitted with the paddle attachment add the dry cake mix and lemon pudding powder and mix on low speed for 30 seconds.
Add the lemon zest, ½ cup water, ½ cup lemon juice, and 4 eggs. Mix on low -medium speed for 1 minute. Add ½ cup oil and mix again.
Fill the prepared bundt cake pan with batter. Bake for 35 mins.
Cool for 10 mins then flip over onto a cooling rack to cool completely.
Mix the ½ cup confectioners sugar with 1 tbsp cream and ½ tsp lemon zest until fully combined.
Drizzle over cooled cake.