1 pkg. yellow cake mix
1 c. pina colada drink mix
1 can sweetened condensed milk (not evaporated milk)
1 carton Cool Whip

Bake cake as per instructions. While still hot, punch holes in cake with a toothpick and drip drink mix, then evaporated milk, on cake. Allow cake to cool and set for 1 hour. Top with Cool Whip.