Swift's Grammy message to her ex
The 23-year-old country superstar sported a white top hat, tail-coat and hot pants as she belted out We Are Never Every Getting Back Together.
Halfway through the song she broke into a deep British accent to say: "So he calls me up and says I still love you.
"But I said, I'm sorry, I'm busy opening up the Grammys - and we're never, ever getting back together."
She joked she would probably be "off in a warehouse somewhere" on February 14, "working on the lighting rig and the lighting cues" for her upcoming tour.