This is already included in Princess Plus & Princess Premier Packages, no need to add this option if you selected one of these.
During your cruise a 18% gratuity is added to bar charges and dining room wine accounts. This is shared amongst the beverage staff and their support staff. We know you will find these services onboard exemplary.
Casino dealers and Lotus Spa® personnel do not share in these gratuities, as not all guests utilize these services.