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Taylor Swift brought members of her witches coven to London over the weekend.

On Saturday evening, the most popular singer in the world was performing inside Hyde Park and belting out a rendition of “Style” when Kendall Jenner showed up on stage.

And so did Cara Delevingne. And Gigi Hadid. And Martha Hunt. And Karlie Kloss. And even Serena Williams!

"Cool down after the @TaylorSwift concert with my BFF @Carowozniacki," Williams wrote on Instagram after the unexpected camea.

During an earlier stop on her 1989 World Tour, Swift shocked concert goers by bringing Mariska Hargitay and Delevingne out on stage with her in Philadelphia.

Check out the fun "Style" performance above and take note, anyone attending a future Taylor Swift show:

You never know who may show up for it!