Taylor Swift Brought Olivia Benson Out On Stage

    Now that's one concert we're sad to have missed.

    Sheridan Watson
    by Sheridan Watson

    BuzzFeed Staff

    By now, you should have seen the music video for Taylor Swift's "Bad Blood."

    Via youtube.com

    And if you haven't, go do that... NOW.

    As you can see, she casted a whole bunch of famous people in it.

    https://instagram.com/p/2dk4XNDvNB/?taken-by=taylorswift
    https://instagram.com/p/2ZRzeuDvNY/?taken-by=taylorswift
    https://instagram.com/p/2t_9NpDvEk/?taken-by=taylorswift

    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.

    At her Detroit stop, she brought out supermodels Gigi Hadid and Martha Hunt who played Slay-Z and Home Slice, respectively.

    In Pittsburgh, she had Little Big Town sing a tune.

    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.

    Casual.

    Who's gonna be next?