1. Preheat the oven to 350 degrees and grease a 9x13 inch cake pan with nonstick cooking spray. 2. In a large bowl, beat together the cake mix, oranges, eggs and oil, until well combined. 3. Pour the batter in the prepared pan and bake in the preheated oven for 25 to 30 minutes, until a toothpick inserted into the cake comes out clean. 4. To make the topping, mix together the whipped topping and vanilla pudding until combined. 5. Allow to rest for five minutes to give the topping time to absorb the pudding, then add the pineapple and stir to combine. 6. Spread the mixture over the cake after it has completely cooled. Sprinkle coconut over the top of the cake before serving.