Preheat oven to temperature listed on cake mix box. Grease and flour a 9x13 inch baking pan.
Prepare cake batter according to package directions. Pour into prepared pan and bake for time listed on box, until a toothpick inserted in center comes out clean. Allow to cool completely.
In a large bowl, beat cream cheese and butter until light and fluffy. Gradually add confectioners' sugar and vanilla, beating until smooth.
Spread frosting evenly over cooled cake.
In the top left corner, arrange blueberries in rows to create a blue square.
Arrange strawberry slices in horizontal rows across the remaining white area to create red and white stripes.
Refrigerate until ready to serve. Slice and enjoy your festive American Flag Cake!
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