World's largest cruise ship.

 Harmony of the Seas

The 120,000-tonne, 16-deck ship .

Harmony of the Seas, the world’s largest cruise ship.
Some 2,000 crew are to cater for the needs of more than 6,000 passengers on Harmony, which is a metre wider than the current twin ocean-going monsters of the pleasure cruise world

Source:http://www.theguardian.com/world/2016/mar/11/world-largest-cruise-ship-harmony-of-the-seas-sets-sail-first-sea-trial