Cook pasta according to package directions; drain. Return to pan. Stir in pasta sauce, meatballs, and tomato sauce. Transfer to an ungreased 13x9x2-inch glass baking dish or 3-quart rectangular casserole. Bake, covered, in a 350 degrees F oven for 30 minutes.
Meanwhile, in a small bowl combine ricotta cheese and Parmesan cheese. Uncover pasta mixture and spoon ricotta mixture in mounds over pasta mixture. Cover loosely; bake about 10 minutes more or until heated through. Top with mozzarella cheese and bake, uncovered, for 5 minutes more. Makes 8 to 10 servings.