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There were fireworks, singers and a world first – a naming on Twitter – when P&O launched their new fleet on Sydney Harbour this morning.

But two little girls named Aria (in blue) and Eden (in pink) stole the show from Jessica Mauboy and Kate Ritchie by having two cruise ships named after them.

The two stars named their ships by pointing their phones and firing off a tweet.

The other three ships were moored at anchor with 9000 guests watching on.