Mix cake, sugar, and pudding mix, either by hand or with mixer on low speed. Once it's mixed good, make a little well in the center of the mixing bowl.
Pour in water, oil, eggs, and cream cheese. Beat on low with mixer for about 2 minutes or so. Then, scrape the bowl good & beat 4 mins on medium.
Add poppyseeds, lemon zest & stir by hand. Then, add the blueberries gently and stir lightly.
Pour into bundt pan & bake for 55 mins (or until center is baked through according to your oven.) Let cake cool completely before turning upside down onto cake plate. Serve & enjoy. You could make a glaze for on top of this, but it really doesn't need it.