Trans Supermodel Joins Taylor Swift's Performing BFF Squad

Any Taylor Swift fan knows that the singer has a huge circle of female pals -- those women, who include such celebs as bisexual model Cara Delevingne and acclaimed writer Lena Dunham -- travel, party, and sometimes sing and dance with her.

During her 1989 tour, Swift has brought her friends onstage with her to perform her hit single "Style." Sunday night in Chicago, Swift had Victoria's Secret "Angel" Lily Donaldson and transgender supermodel Andreja Pejic join her for the song.

Australian-born Pejic, 23, is the world's most famous trans model and was recently featured in American Vogue. Pejic is also the first transgender model to land a cosmetic campaign.

Though Pejic is killing it career-wise, she is not widely known outside of fashion and queer circles (watch a 2011 video interview with Andreja below). But that will likely change thanks to her recent appearance next to, quite possibly, the world's most famous woman.