So we all know Taylor Swift has A LOT of celebrity pals. Like an extreme amount.
Check out the Bad Blood music video if you’re in doubt.
And a few of the ass-kicking stars turned up onstage with Taylor after she brought her 1989 World Tour to British Summertime at Hyde Park on Saturday night.
Flying the flag for the UK (literally) was Cara Delevingne along with fellow models Gigi Hadid, Martha Hunt, Kendall Jenner and Karlie Kloss.
But there was one new lady to be initiated into Tay Tay’s girl crew… and that was grand slam champion and tennis ace Serena Williams.
Serena shimmied down the stage along with Swift and the model posse and she totally held her own.