COOK spaghetti as directed on package. Drain, reserving 1 cup cooking water. Cover spaghetti to keep warm.
BLEND 1 cup cooking water, 1/4 cup dressing, chiles, cilantro and nuts in blender until smooth.
HEAT remaining dressing in large skillet on medium heat. Add shrimp; cook 5 min. or until pink, stirring occasionally. Add spaghetti and sauce mixture; mix lightly. Serve topped with cheese.