Which Of Taylor Swift's Famous Besties Took The Stage On Her 1989 Tour?

Taylor Swift invited music and fashion world friends to the stage for the Detroit stop of her tour.

Taylor Swift's 1989 tour is already one for the books with bright, sparkly outfits, large stage sets, and a roster of songs you've been singing all year. But during her latest tour stop in Detroit, she upped the ante by inviting a couple of friends to join her for the party.

The show took a rock turn when Taylor added Dan Reynolds from Imagine Dragons to sing his group's mega hit, "Radioactive." Taylor described part of their duet as a "RAGE FEST" and from the looks of these pics, she's not wrong.

Taylor also added a little supermodel power with her "Bad Blood" costars Martha Hunt (aka Homeslice) and Gigi Hadid (aka Slay-Z).

But rather than bring them out to reenact the now-iconic music video, she invited the two fierce fashionistas to strut down the stage's catwalk for "Style." Totally fitting!

"I got to be the proudest friend ever & dance and sing with all of you amazing people!!!!!!!!!!" Gigi wrote enthusiastically on Instagram. "Your love and passion will NEVER GO OUT OF STYLE."

By now, we've come to expect superstar surprises from Taylor. What's in store for upcoming tour stops?