Just when you think Taylor Swift's female friend posse has stabilized, the world you think you know gets turned upside down.

There's a new member of the squad. And she's a wizard. I mean, actress. It's Hermione! I mean, Emma Watson. Where are we?

Watson attended Swift's concert in London on Saturday, and posed for pics backstage with TSwift's current preferred conglomeration of allied beautiful famous women. This weekend, the other power females included Karlie Kloss, Martha Hunt, Lauren Aquilina, and Sydney Sierota.

Sources: Mashable