We all remember the big feud between Swift and ex-boyfriend Calvin Harris over this song, which was released as a single by Harris featuring Rihanna.
Rumour has it that Swift and Harris have since put their Bad Blood behind them so perhaps that is why she's singing that testy song now.
The pop star performed this weekend, at her only concert of the year, during the Formula 1 USGP in Austin. An estimated 80,000 fans showed up to see her.
Sitting at a piano, she said: ‘I’ve never played this song live before. But if you know it, maybe you could sing along, and then I could get to know what that feels like to hear it sung back to me.’
She then sang a low-key version of This is What You Came For, which she wrote the lyrics with Rihanna, credited with the pseudonym, Nils Sjoberg:
— Taylor Swift Updates (@tayIorscurIs) October 23, 2016
Here’s the performance from another angle:
— Erin Rose Jensen (@ErinRoseJensen) October 23, 2016