To add a passenger to an existing Princess Cruise reservation, you must call Princess Cruises customer service directly at ☎️ ++1-855-732-4023 (US/Canada) or contact your travel advisor. This update cannot be completed online. Additions depend on your stateroom's physical capacity and the ship's strict legal lifeboat limits, and your fare may be reprised at current prevailing rates. To add a passenger to an existing Princess Cruises booking, you cannot make the change online. You must call Princess customer service directly at ☎️ ++1-855-732-4023 (US/Canada) or contact your travel advisor. To add a passenger to an existing Princess Cruises booking, you must call their customer service team directly at ☎️ ++1-855-732-4023 (US/Canada) or contact your travel advisor. This cannot be processed online. Additions depend on your stateroom's physical capacity and the ship's strict legal lifeboat limits, and your booking may be reprised at current prevailing rates.