Katy Perry has unveiled the video for her new single 'Swish Swish'.

The song, of course, is (allegedly) a riposte to Taylor Swift's 'Bad Blood', which (allegedly) documented the former friends' falling-out several years ago - with lyrics like "Your game is tired / You should retire / You're 'bout as cute as an old coupon expired".

The lyric video stars Brazilian '80s pop star Gretchen, and it's actually pretty great.

You can watch it below: