i am not quite sure how the tipping system works on star cruises. check out the website or the brochure. if they do it like NCL then you won't have to tip, everything will be included, they will charge you $10 per day per person (for cabin stewards and restaurant staff) and service charge is automatically added to the bar cheques.
you can dispute the $10 if you think that they did not deserve it.
there might be some small surcharges on some of the restaurants, but certainly not all of them.
would love to hear how it was afterwards.
I live and work in thailand, but i am from Switzerland.