In a mixing bowl, combine yellow cake mix, vegetable oil, eggs, and mandarin oranges including the juice.

Use a hand mixer to blend until smooth.

Pour batter into a greased cake pan.

Tap the pan to remove air bubbles.

Bake according to cake box instructions, about 20 minutes.

Remove from oven and let cool completely.

Meanwhile, in a bowl, mix crushed pineapple with vanilla pudding mix.

Fold whipped topping into the pineapple and pudding mixture.

Spread the frosting over the cooled cake.

Garnish with mandarin oranges and sliced pineapple. Serve and enjoy!