A cruise ship christened by Katy Perry has docked in Portland.

The Norwegian Prima, on its maiden voyage, was christened by the pop star at a stunning ceremony in Reykjavik earlier in the week.

With capacity for 3,099 guests, and costing over $700million to build, the cruise markets itself as being for "the trailblazers and the tastemakers".

It arrived in Portland this week as part of an eight day tour to Amsterdam.

The ship boasts 20 decks - nine of which have cabins on - as well as go-kart track for guests to race around on.

Public areas and suites on board the boat were designed by, renowned Italian designer, Piero Lissoni.