Preheat oven to 350.

Spray a 13x9 pan with non stick spray.

Prepare cake mix as directed on package, using eggs, orange juice (instead of water) and oil.

Pour into prepared pan.

Bake for 30-40 minutes until cake springs back when touched.

Allow cake completely cool.

Using a skewer, poke small holes all over the cake, piercing all the way to bottom.

In a bowl, combine Jell-O and boiling water and stir until gelatin is completely dissolved.

Add cold water, mix well and slowly pour this mixture over the entire cake.

Cover and chill for 2 hours.

Combine the pudding mix, milk and vanilla and beat well.

Fold Cool Whip into the pudding mixture and use it to frost cake.

Cover and refrigerate for 4 hours.