Preheat the oven to 350°F (175°C). Grease and flour the bundt pan.

In a large mixing bowl, combine the cake mix, water, vegetable oil, eggs, and sour cream. Mix until well combined.

Pour the batter into the prepared bundt pan.

Bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.

Allow the cake to cool in the pan for 10 minutes, then invert onto a wire rack to cool completely.

In a mixing bowl, beat the cream cheese and butter together until smooth.

Gradually add the powdered sugar and vanilla extract, mixing until creamy.

Once the cake is completely cooled, frost the top of the bundt cake with the cream cheese frosting.