WHAT?! Trouble Alert: Taylor Swift Sings "This Is What You Came For " On Stage

'

Taylor Swift's fans were very excited on Saturday night as She climbed up on stage,  she did not disappoint them at all.
"Welcome to F1 on a Saturday night," the audibly beloved star welcomed close to 80,000 screaming fans as she strutted across the stage in a short, black, sparkly number.

'During her first and only concert performance of 2016, Formula 1 U.S. Grand Prix weekend in Austin, Texas, the Grammy winner tore through a number of her hits—but the cherry on top may have been a stripped-down version of "This Is What You Came For," the track Swift co-wrote for then-boyfriend Calvin Harris that became a huge, song-of-the-summer hit for the Scottish DJ-producer and Rihanna.
Taylor's backing vocals can be heard on the single, and she did a little lip-syncing during New York Fashion Week, but this was the first time she's publicly performed the tune start to finish. The Internet was set ablaze with anticipation earlier in the day after video of her rehearsing at a piano during a sound check made the rounds. She further said:
"As a songwriter, the most rewarding feeling in the world is writing something and having a crowd sing it back to you because you know the words," Taylor told the audience, which she had encouraged to join her at every turn. "I never played this song live before, but you know it. Maybe you can sing along."
Swift initially agreed to recede into the background when Harris went around promoting the song when it came out in April, but once the chorus detectives got wind of Tay's voice on the song and connected her with the co-writer listed on Wikipedia—Swift's sometimes-alias, Nils Sjoberg—then the ruse was up.'
I know trouble when I see it.....