Lorde flew how long to perform a single song at Taylor Swift's concert?

Taylor Swift has had many surprise celebrity guests gracing the stage of her 1989 tour, but none of them travelled nearly as far as Kiwi songstress Lorde.

Check out the clip above to see Lorde, 18, surprising the crowd at Taylor's Washington D.C. gig with her hit 'Royals'. That's almost a 19-hour flight from Auckland, you guys!

Lorde took to Twitter after the gig to praise BFF Taylor, 25.

At the same gig, Taylor had a stage malfunction that totally stuffed up the choreography for one of her songs. Check out that clip below…