Preheat the oven to 350 degrees Fahrenheit and set a clean bundt pan to the side. Do not grease it yet.
In a large mixing bowl beat together the cake mix and orange zest on low speed with a hand or stand mixer until fragrant.
Mix in the eggs, orange juice, melted butter and sour cream until smooth and combined.
Grease your bundt pan well and pour the batter into it, evening the top with a spatula or spoon.
Bake for 35-40 minutes or until the top bounces back when tapped gently, a toothpick comes out clean or a digital thermometer reads at least 200 degrees Fahrenheit internally.
Allow to cool for 10 minutes and then turn out onto a cooling rack or serving tray.
After the cake has cooled completely, about 1 hour, whisk together the powdered sugar and orange juice, 1 Tablespoon at a time, until smooth and thick. You can adjust the amount of orange juice you use to get the glaze to reach a thicker or thinner consistency.
Drizzle over the cake and allow to sit for 5-10 minutes or until set before cutting and serving.