POUR milk into medium bowl. Add dry pudding mix. Beat with wire whisk 2 min. Gently stir in 1-1/2 cups of the whipped topping.
LAYER half each of the cake cubes, strawberries and blueberries in large serving bowl; cover with pudding mixture. Top with layers of the remaining cake cubes, fruit and whipped topping.
REFRIGERATE at least 1 hour before serving. Store leftovers in refrigerator.