Add butter to outside slices of bread and toast lightly under broiler in oven. Set aside.
Combine chicken and hot sauce in a skillet. Heat throughly.
Add in cream cheese, cheddar cheese and blue cheese dressing. Mix well.
Cook over low heat until cheese is melted. Stirring often.
Spread mixture on 4 bread slices.
Top with a drizzle of blue cheese dressing.
Cover with remaining 4 bread slices.
Serve with blue cheese dressing and celery sticks.