Chicken Tettrazini

2 cups cooked chicken diced or shredded

1 (8 oz) pkg. spaghetti noodles

1 small jar cheez whiz or block velveeta

1 can cream of chicken soup

1 small jar pimentos

1 onion

chopped celery

Cook noodles according to pkg.  Saute celery and onions in butter.  Add cheese to drained noodles and mix well.  Add soup, sauteed veggies, pimentos and chicken.  Spread in a 9x13 baking dish. Bake at 350 for 30 mins.