You've seen the completed video, you've seen how she became a zombie in it - and now you can see how Taylor Swift fought multiple versions of herself in the 'Look What You Made Me Do' video.

The Joseph Kahn-directed video has been viewed over 423 million times in the three weeks since its release, and has been praised for both its tongue-in-cheek humour and its impressive special effects.

One of them sees the pop star seemingly fighting with different versions of herself - and now a 'behind-the-scenes' video has been released showing exactly how it was done.

Watch it below: