Swift, one of the most successful contemporary music artists, earned $170 million between June 2015 and June 2016, following a world tour and her best-selling "1989" album, Forbes Magazine said.
Wearing a dark blouse and with her hair pulled back, she was accompanied in court by her mother Andrea.
Swift, 27, has said that David Mueller, 55, fondled her four years ago during a photo shoot before a concert in Denver.
The case centers on Swift's allegations that Mueller intentionally reached under her dress and grabbed her bare behind during a 2013 meet-and-greet at one of her concerts. "It was completely intentional, and I have never been so sure of anything in my life". The Shake It Off singer responded with a countersuit, accusing him of sexual assault and battery, and lawyers for the two sides headed to federal court in Denver on Monday to begin picking jurors for the trial.
Mueller, who also attended jury selection, denies the allegation and says the photo only shows him trying to jump into the frame.
But she does have to be present for the rest of the trial and is expected to testify.
The trial is scheduled to last through August 17, but may not fit in that time frame. "Swift or put his hand under her skirt".
Mueller and his witnesses will be first to take the stand and be cross-examined after opening statements.
Initially, Swift attempted to keep the situation "discreet and quiet and confidential" and was upset by Mueller's claim that "for some reason she might have some incentive to actually fabricate this story", her attorney, Douglas Baldridge, has argued in court.
Radio host David Mueller sued the singer-songwriter, saying he was falsely accused and that she should have called police instead of his bosses, who fired him soon after the June 2013 encounter.
In the suit, Swift said she not only wants to hold Mueller accountable, but also hopes to "serv [e] as an example to other women who may resist publicly reliving similar outrageous and humiliating acts".
Mueller's attorney, Gabriel McFarland, showed the eight-member jury a picture from the photo shoot and said Mueller's hand was not under Swift's skirt.
Jury selection ended for the day and will resume Tuesday. His lawsuit said Swift's accusation is "nonsense".
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