WATCH: Taylor Swift Sings Ex Calvin Harris’ “This is What You Came For” at Concert

Hmm. What could Tay-Tay be up to?

At the Formula 1 Grand Prix show at Austin Texas, fans were shocked to hear Taylor Swift suddenly sing her former boyfriend’s hit song with Rihanna, “This is What You Came For.” This comes as a surprise as the two had a not-so-good and quite-a-public rollercoaster drama of a break-up. There were Twitter rants, an Instagram purge of each other’s traces, and, of course, the cherry on top of it all, Taylor suddenly caught hooking up with Tom Hiddleston just a few weeks after the break-up. Yikes.

The song is quite controversial as well, as after the split, Calvin revealed that Taylor is one of the song’s writers under a pseudonym, which Taylor was not happy about. Seriously. Messy.

So why the hell is she suddenly singing it at her show? ” I’ve never played this song live before,” was all the pop star said. Watch the performance here:

https://www.youtube.com/watch?v=nl4Guwu3Hbg

What do you think? Do you have an idea what might be going on here?? Share your thoughts in the comments!