Mueller's suit doesn't seek a specific monetary amount, but an expert retained by the ex-radio host determined that almost $3 million was a fair compensation for damages.
Swift, who's also expected to testify, claimed in a countersuit obtained by ABC News that Mueller "took his hand and put it up my dress" during the publicity event, and it "was not an accident".
Taylor Swift's counter-lawsuit argues that the case will "serve as an example to other women who may resist publicly reliving similar outrageous and humiliating acts".
Swift's lawyers have said the photo is "damning" proof that Mueller did inappropriately touch her.
During cross-examination the mother added that she couldn't believe Taylor thanked Mueller for being there. Swift then countersued for assault and battery.
During the trial, Swift's attorney repeatedly asked Mueller if he could find "any reason, incentive or motive for Miss Swift" to make up allegations.
Andrea Swift recalled that Taylor told her, "Mom, a guy just grabbed my a**" and that the incident left her daughter "shaken" and "humiliated". Today's court proceedings were delayed by a closed evidentiary hearing that lasted almost two hours.
The lawyer said that Swift has made the case into "a crusade for women's issues", stretching its implications beyond the incident in question.
- Andrea Swift, the singer's mother, was involved in the decision to contact Mueller's boss and not call the police.
According to Baldridge, Mueller had destroyed five laptops or cell phones that may have contained recorded evidence of his meeting with KYGO executives, possibly including other references to the DJ's behavior that the radio station was not happy with. He did admit he may have accidentally touched her ribs.
"It cost me my career.the thing I love the most", Mueller said.
"If anyone touched her rear she has the right to not like that", he said.
McFarland told jurors that the photo does not show Mueller's hand under Swift's skirt and that the skirt was not rumpled. "It's an assault", Baldridge said.
Swift's staff reported the incident to KYGO executives who fired Mueller two days later for violating the morals clause of his contract, the court has heard.
In turn, Swift is also suing for a monetary amount - but it is far less than what the former DJ is asking. Judge William Martinez granted Swift's request to seal the photo until the trial on the grounds that it could prejudice potential jurors, but it was leaked in 2016. Mueller said: "I thought he was just telling me one of his stories".
Testimony will continue today in the eighth-floor U.S. District Court courtroom in the Alfred A. Arraj Courthouse.