Preheat the oven to 350°F and grease and flour a 10 to 12-cup Bundt pan.

In a large bowl, using an electric mixer, combine the cake mix, pudding mix, vegetable oil, orange juice, and eggs. Mix for about 2 minutes. Pour the cake mix into the prepared pan.

Bake for 35 to 40 minutes or until a toothpick inserted in the center comes out clean and the cake is just starting to pull away from the sides of the pan. Allow the cake to cool in the pan while you make the glaze.

In a small saucepan, combine the powdered sugar, orange juice, and butter. Cook over medium-low heat until the butter has melted, stirring frequently.

Use a skewer or toothpick to poke holes in the cake. Pour the warm glaze over the cake while it is still in the cake pan. Allow to cool for 15 to 20 more minutes or until the cake is cool and most of the glaze has been absorbed, then invert the cake onto a serving platter. Allow to cool completely before serving. This cake is best served after it has rested for about 8 hours.