If you shave all your hair off before going on holiday you wont need a hairdryer....there problem solved.
Have you tried the hair dryer that doesnt need electricity? It's called a towel.
Im such a comedian. lol.
The newer Princess's [Ruby/Royal] do have 110/220v but the older ones are just 110v but does your hair dryer not have a dual voltage setting so it should cope as well on board as at home.
Ah I see! I have seen dual voltage hairdryers but didn't realise it meant you could switch between the two (according to the voltage available)and the hairdryer would work just the same - duh!