Preheat oven to 350 degrees. Coat 13X9 inch baking pan with nonstick cooking spray.
Prepare cake mix according to package directions. Pour batter into prepared pan. Bake 35-40 minutes or until toothpick inserted in center comes out clean. Cool in pan 5 minutes.
Meanwhile, combine condensed milk, milk and whipping cream in 4 cup measuring cup. Poke holes all over warm cake with toothpick Slowly pour milk mixture evenly over top of cake. Let cake stand 10-15 minutes to absorb liquid. Cover, refrigerate at least 1 hour.
When completely cool, spread whipped topping over cake. Garnish with fruit if desired.