Preheat oven to 350 degrees.
Toss hot rigatoni, 1-1/2 cups mozzarella, ricotta, parmesan and 1/2 jar pasta sauce; turn into 13-by-9-inch baking dish. Evenly pour on remaining pasta sauce.
Bake, covered, 30 minutes or until heated through. Top with remaining 1/2 cup mozzarella and let stand until cheese is melted.