Around 150 Santas performed Psy's signature horse-riding dance on a navy ship in Sydney on Saturday.
It may seem early for Christmas celebrations, but it was a chance for people to put on Santa suits and have a little fun for a good cause.
The event launched the variety Santa fun run, which raises money for children with special needs.
It also coincided with the Australian royal navy's open day.
South Korean rapper Psy's "gangnam style" dance has been mimicked by people around the world.
The video has more than 270 million views on You Tube and counting.
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