Taylor Swift Adds Emma Watson to Her Squad, Has Most Star-Studded Performance of "Style" Yet: Pics

Martha Hunt, Karlie Kloss, Emma Watson, Taylor Swift, Sydney Sierota, and Lauren Aquilina pose together backstage in London on June 27. Credit: Courtesy of Lauren Aquilina/Twitter It was only a matter of time!Taylor Swiftis known for her star-studded posse of Millennial gal pals, and on Saturday, June 27, she addedHarry Potteralum and feminist activistEmma Watsonto the gang. PHOTOS: Taylor's celebrity BFFs In a cute group shot, posted by British singerLauren Aquilina, the "Blank Space" singer, 25, posed with her arm around the He For She advocate, 25.Martha Hunt, Kendall Jenner, Serena Williams, Taylor Swift, Karlie Kloss, Gigi Hadid, and Cara Delevingne pose together on stage in London on Saturday, June 27. Credit: Dave Hogan/TAS/Getty Images "Spent tonight surrounded by badass girls and couldn't be happier about it," Aquilina captioned the photo with modelsMartha Hunt, Karlie Kloss, Watson, Swift, and singerSydney Sierota. PHOTOS: Taylor's sparkly sequin dresses And the Grammy-winning singer didn't stop there. That same night, she also brought six of her famous pals, including Hunt,Kendall Jenner,Serena Williams,Kloss,Gigi Hadid,andCara Delevingne, onstage with her during her performance of "Style" at her London concert in Hyde Park. this is love. ?????????? #1989TourLondon pic.twitter.com/M5mJAfVsnE— Gigi Hadid (@GiGiHadid) June 28, 2015 PHOTOS: Taylor's song lyrics decoded Hadid later shared a backstage shot via Twitter, writing, "this is love. #1989TourLondon." Sign up now for the Us Weekly newsletterto get breaking celebrity news, hot pics, and more delivered straight to your inbox