Photo Illustration by The Daily Beast / InstagramDuring the initial, American leg of the Eras Tour, Taylor Swift’s career-spanning spectacle already drew the attendance of nearly every famous person in Hollywood. But it wasn’t until the show went international that Katy Perry, one of the pop star’s former nemeses, popped up to pay her respects. Perry posted video of herself jamming to “Bad Blood,” Swift’s diss track about their now-squashed beef, from Swift’s Friday night concert in Sydney, Aust