Celebrity·Posted on Jun 13, 2015Taylor Swift Brought Olivia Benson Out On StageNow that's one concert we're sad to have missed.by Sheridan WatsonBuzzFeed StaffFacebookPinterestTwitterMailLink By now, you should have seen the music video for Taylor Swift's "Bad Blood." Tap to play GIF Tap to play GIF As you can see, she casted a whole bunch of famous people in it. Well flash forward: Taylor is now on her 1989 tour. And she's been bringing along some of her "Bad Blood" pals for the ride. View this photo on Instagram At her Detroit stop, she brought out supermodels Gigi Hadid and Martha Hunt who played Slay-Z and Home Slice, respectively. View this photo on Instagram In Pittsburgh, she had Little Big Town sing a tune. View this photo on Instagram But for her Philly stop, Tay Tay decided to step it up a bit. She surprised her fans with Cara Delevingne and MARISKA FREAKIN' HARGITAY. View this photo on Instagram Casual. View this photo on Instagram Who's gonna be next? View this photo on Instagram