Please Welcome to the Stage: Every Single Surprise Taylor Swift Guest

Who?! Gigi is a new It girl on the fashion scene who's steadily blowing up. She's scored plenty of campaigns, landed a few Vogue covers, and walked more runways than just Taylor's.

Where?! Detroit, MI.

Why?! Taylor and Gigi have gotten superclose over the past few months, and we're assuming they met through Taylor's bestie, Karlie Kloss (or maybe Martha Hunt). Either way, they've been spotted hanging out a ton, including at Taylor's Fourth of July party.