Cruising Grandma is correct. I sailed on my 4th cruise over Christmas 2003. All cruises have been in Cat 3 or Cat 2. There is an additional outlet in the wall behind the right hand drawer of the dressing table - if I recall correctly it is always the right hand drawer.
You are able to plug in your (their) blowdryer and forget about it in that drawer. I always bring at least two extension cords for our Blow Dryers, Curling Irons, Cell Phones, Digital Cameras and other paraphenalia. I just really like being prepared for anything.