1. Heat oven to 350°F Spray a 13x9-inch baking dish with cooking spray.
2. In large bowl, stir together cake mix, pudding and pineapple. Pour into prepared baking dish.
3. Bake 20 minutes or until toothpick inserted in center comes out almost clean. Cool completely on a rack.
4. Spread whipped topping over cake. Sprinkle with coconut. Cover and refrigerate until ready to serve.