Here's what you need to know:
Jury selection will begin Monday for his lawsuit against her and her countersuit.
Teen Vogue explains that the incident in question revolves around Swift claiming that Mueller groped her at a pre-concert meet-and-greet in Denver in 2013. That moment appears to have been caught, at least partially, in a photograph.
Then 51, Mueller claims the allegations caused him to lose his job, and he's suing for slander. She is countering and believes that this case will "serve as an example to other women who may resist publicly reliving similar outrageous and humiliating acts."
"Right as the moment came for us to pose for the photo, he [Mueller] took his hand and put it up my dress and grabbed onto my ass cheek, and no matter how much I scooted over, it was still there... it was not an accident," the "Bad Blood" singer said in a deposition. "It was completely intentional, I've never been so sure of anything in my life." He countered by saying, "Our hands touched and our arms crossed. That's all I remember."
TMZ shares that Swift is not expected to come to court every day. Still, 32 seats will be held each day for the public and given out on a first-come, first-serve basis.
[Photo: Getty Images]