When the Pacific Jemm isn't showing prime ministers a good time, it's helping marry Australia's same-sex couples.

The luxury super yacht, moored in Queenstown, is part of a booming local wedding industry that welcomes hundreds of Aussies.

Last month it also hosted the trans-Tasman leaders and their wives on a dusk cruise.

The yacht's Blair Payne says there has been a huge increase in weddings with Australians, especially gay couples, since the country legalised same sex marriages in 2013.

"We would be one of the first venues in New Zealand once it became legal," he told AAP.

He estimates the yacht has hosted over 40, with 80 percent being female couples.

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"As a business we would be very happy for Australia to not make it legal there, because it is good business for Queenstown and New Zealand."

Many enjoy a morning ceremony before an afternoon on the ski slopes or a relaxing day taking in the Lord of the Rings movie backdrop, he said.

Others enjoy a helicopter ride to the top of the towering Remarkables with just a celebrant and a photographer to capture the moment with the incredible view.

It's estimated the bustling resort town hosts more than 1000 weddings a year.

But that's not all - it's also a popular destination for blessing ceremonies among Japanese and Chinese visitors.

Numbers have grown year on year, the Queenstown Wedding Association calculates.

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