We cruised with celebrity on constellation in April brilliant you'll have a wonderful time with celebrity We paid the tips up front as you are doing but also tipped our waiters and steward extra during the cruise as we thought they were excellent however you do not have to do this. You will be given an envelope at the end of the cruise which you hand over to the staff telling them you have prepaid the tips. Hope this helps.
No more tips to pay but don't forget 15% that is added to any drinks purchase.
Yes is the bad news, you will still be charged the service charges applicable for extras like drinks etc in the bars, speciality resturants, coffee and teas, it is better to have your tea/coffees etc from room service who do not charge or applya service charge. We never pay up front, wait to see what your service is like then tip what you think is fair .
Correction: If you get room service it is considered polite to tip the delivery guy a few $ as they are doing this in their spare time to earn a bit more.