Pineapple Cake

 1 package yellow cake mix (regular size)
1 can (11 ounces) mandarin oranges, drained
1 can (20 ounces) unsweetened crushed pineapple, drained
1 package (3.4 ounces) instant vanilla pudding mix
1 package (12 ounces) frozen whipped topping, thawed

How to make it :

Prepare cake batter according to package directions. Beat in oranges until blended. Pour into two greased and floured 9-in. round baking pans.
Bake at 350° for 25-30 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes before removing from pans to wire racks to cool completely.
Combine pineapple and dry pudding mix; fold in whipped topping. Spread between layers and over top and sides of cake. Store in the refrigerator.