Dole Whip Poke Cake

Name: Dole Whip Poke Cake
Cuisine: American
Ingredients: 1 box white cake mix (you'll also need the for the box's recipe, but will be replacing the water with pineapple juice); 1 large can pineapple juice (to use as mentioned above, and below, and to use in the icing as well); 2 small (4 servings each) boxes vanilla instant pudding mix; 1 cup milk (I use skim, only because that's what we always have); Icing; 1 (16 ounce) tub whipped topping, thawed; 1 can sweetened condensed milk; additional pineapple juice from the large can in cake