Cook pasta according to pasta directions
In a large skillet cook ground beef until cooked through and drain
In skillet with ground beef add diced tomatoes, pasta sauce and cream cheese
Cook until cream cheese is melted, stirring frequently.
Pour meat mixture into pot with pasta and mix well
Spray a 9x13 inch pan with non stick spray and add the pasta mixture, then the sour cream and all but one cup of the mozzarella cheese and then the final layer of pasta. Sprinkle parmesan cheese and the remaining one cup of mozzarella cheese.Bake 15-20 minutes or until heated through.