In a large bowl, place the shrimp, cream cheese, mayonnaise, pimento cheese, horseradish, green onion, celery, lemon juice, Old Bay seasoning.
12 ounces cooked deveined salad shrimp, thawed and drained well, 12 ounces cream cheese, softened, 1/2 cup mayonnaise, 3/4 cup pimento cheese, 2 tablespoons horseradish, 2 green onions, diced small, 1/2 cup celery, diced small, 1 1/2 teaspoons Old Bay Seasoning