A mashup of Britney and Sia singing 'Passenger' has appeared on the internet

In other Sia news, someone's got hold of her original vocal for Britney's 'Passenger' and put a massive donk all over it.

To be more specific, Country Club Martini Crew have done the donking and not only that but they've sort of done it as a mash up and included bits of 'Britney''s vocal too.

Plus, as MuuMuse reports, they've been kind enough to do a club mix and a radio edit, so that's all bases covered really.

Here's the club one:

Here's the radio edit: