Heat oven to 350°. Grease and flour a 12-cup Bundt cake pan.
In a mixing bowl combine the cake mix, eggs, vanilla, lemon extract, oil, and cream cheese. Beat for 2 minutes with an electric mixer at medium speed. Stir in the blueberries and spread in the prepare Bundt cake pan.
Bake for 45 to 55 minutes, until a wooden pick or cake tester inserted in the center of the cake comes out clean.