It looks like Lorde has been added to the long-growing list of musician friends Taylor Swift has brought with her on stage during her 1989 World Tour.

Lorde joined Swift during Monday night’s show in Washington, D.C. to sing her hit song “Royals” with her BFF.

“Maybe I’ll give you some hints and see if you can guess it before I say who it is,” Swift teased, in the video. “This artist flew 19 hours from her hometown to be here to perform for you.”

Lorde, who is from New Zealand, then came out and the two performed the song to a roaring crowd.

On Saturday’s show in East Rutherford, New Jersey, Swift welcomed Nick Jonas and the two sang his hit, “Jealous.” The Weeknd also came out on Friday, the first show at MetLife Stadium in East Rutherford, to sing his new single “Can’t Feel My Face.”

That’s not all, either. Hollywire has an updated list of every artist Swift has brought out with her during her 1989 World Tour. The list includes, Rachel Platten, Imagine Dragons and Echosmith, to name a few.

Swift has also brought out her non-musician friends to walk out with her during her song “Style” and “Bad Blood” including, Gigi Hadid, Lena Dunham, Karlie Kloss even bringing out Uzo Aduba, from Orange is the New Black.