1. Preheat the oven to 350 F, and spray a 9-by-13-inch baking dish with nonstick cooking spray.
2. In a large bowl, stir together the cake mix, eggs, oil and crushed pineapple along with the juice.
3. Pour the cake batter into the prepared baking dish.
4. Spread it out with a spatula.
5. Bake for 25-30 minutes, until a toothpick inserted into the center comes out clean.
6. Remove the pan from the oven, and set it on a wire rack to cool completely.
7. While the cake is cooling, make the topping. In a medium mixing bowl, stir together the whipped topping, pudding mix and crushed pineapple along with the juice.
8. When the cake has cooled completely, spread the topping evenly over the top.
9. Cut into squares, and serve.
