Taylor Swift sings 'This Is What You Came For' in concert for the first time, crushes it

AUSTIN -- It was Taylor Swift's first concert of 2016, and so, in addition to playing her hits, she had some recent business to catch up on.

Sitting behind a sparkly piano about two thirds of the way through her Formula 1 show Saturday evening, Swift teased that she wanted to try something new.

Cue those "oh oh oohs" from Nils Sjoberg as she played the familiar chorus of the Rihanna and Calvin Harris hit that she co-wrote. (Harris and Swift, of course, were dating at the time the song was written and aren't any longer. So you understand why it is quite the scandalous treat she decided to play it in concert.)

"If you know it, maybe sing along so I could know what it feels like to have it sung back to me?" she requested. Fans happily obliged.

Stay tuned for Mashable's full recap of the concert coming later this evening.