PREHEAT oven to 350°F. Cook pasta as directed on package. Drain pasta, reserving 1/2 cup of the pasta cooking water.
MIX spaghetti sauce, ricotta cheese and reserved 1/2 cup pasta cooking water in large bowl. Add pasta and 1/2 cup of the mozzarella cheese; mix lightly. Spoon into 13x9-inch baking dish sprayed with cooking spray; sprinkle with remaining mozzarella cheese and the Parmesan cheese. Cover.
BAKE 30 min.; uncover. Bake an additional 10 min. or until heated through.