Swift was posing for photos with fans, when David Mueller allegedly put his hand behind her back, "lifted her skirt and groped her." Immediately, Taylor had the 55-year-old escorted from the premises, with the singer's management alerting his employer of what had happened.
Mueller was fired two days later. He then sued the star, her mother and his former employer, claiming he was “falsely accused”, seeking $3.8 million (AUD) in damages.
Swift is counter-suing for assault and battery, taking the stand overnight to relive the "horrifying and shocking" moment.
The 27-year-old told the jury that Mueller’s act was “very intentional," before going on to say that she had never experienced anything like it.
During questioning, Mueller's lawyer, M. Gabriel McFarland, suggested that Swift could have taken a break from the meet and greet after the alleged grope, and asked whether she was critical of her bodyguard for not stepping in to stop what was allegedly happening.
"No, I am critical of your client for sticking his hand under my skirt and grabbing my bare ass," she replied, as reported by CNN.
"I'm not going to allow you or your client to make me feel in anyway that this is my fault because it isn't," the singer continued, before saying, "I am being blamed for the unfortunate events of his life that are a product of his decisions and not mine."
She was also asked why, in the photo that shows Swift posing with Mueller, the front of Swift's skirt is not ruffled.
"Because my ass is located on the back of my body," she said. "It happened to me. He had a handful of my ass. It happened to me. I know it was him," she added when asked how sure she was that it was Mueller who had groped her.
"I didn't need a picture. I could have picked him out of a line of a thousand."
"You can ask me a million questions about it and I'm never going to say something different. I never have said anything different."
Taylor Swift is suing for just $1, and has said she will donate any potential monetary awards from the trial to organisations "dedicated to protecting women from similar acts of sexual assault and personal disregard."
This article previously appeared on marie claire.