Taylor Swift is sending a message... and we hear it loud and clear.

Performing at the Formula 1 U.S. Grand Prix in Austin, Texas on Saturday, October 22, the country-turned-pop superstar utilized her one and only (or at least first) 2016 performance to seemingly throw a bit of shade towards her ex-boyfriend Calvin Harris.

Taking to her piano, the singer debuted her stripped down version of Harris and Rihanna's radio hit, "This Is What You Came For"—a song she wrote under the pseudonym Nils Sjöberg.

Making no mention of the track's producer or original singer, Swift began playing the recognizable melody to the tune while telling the screaming crowd, "As a songwriter...the most rewarding feeling in the world is writing something and having the crowd sing it back to you because they know the words. It’s the coolest feeling in the world."

"I’ve never performed this song live before," she added, reclaiming the Top 40 EDM-pop jam as her own. "But if you know it, maybe you can sing along and I can get to know what that feels like...to have it sung back to me."

The song is, of course, a point of contention for Taylor and Calvin, who were still dating at the time of its release in April 2016, mere weeks before Taylor was spotted with her now former beau, Tom Hiddleston.

After the information was leaked that the 1989 performer had written the smash hit, Calvin slammed Taylor on Twitter, accusing her of trying to "tear [him] down" and "bury him" like she had allegedly done to Katy Perry.

Watch her live performance of the song, below:

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