Cook pasta in large saucepan as directed on package, omitting salt. Remove from pan; drain. Meanwhile, add marinara sauce, tomatoes and cream cheese to same pan; cook on medium heat 5 min. or until cream cheese is melted and mixture is well blended, stirring frequently. Return pasta to pan; mix well.
Layer half the pasta mixture in 13x9-inch baking dish; cover with layers of sour cream, 1 cup mozzarella and remaining pasta mixture. Top with remaining mozzarella and Parmesan.