Taylor Swift was performing at Soldier’s Field in Chicago Sunday night when she  invited models Andreja Pejić and Lily Donaldson to join her on stage.

Says HuffPo: Pejić, 23, made headlines earlier this year when she became the first openly transgender model profiled in Vogue. She confessed to the magazine in April that she gets “a little stressed with runway,” but the Australia-raised beauty looked plenty comfortable rocking out on stage [with Taylor] in a flowing white gown and black thigh-high boots.

“Tonight [Pejić and Donaldson] shut down the runway,” Swift wrote on Twitter. “Crowd went insane!”