Pop star Taylor Swift's former bodyguard has corroborated her account of being groped by a Colorado disc jockey, testifying that he saw the radio personality slip his hand under her skirt as they posed for a photo.
Greg Dent took the witness stand on the fifth day of a US District Court trial in Denver, which pits the 27-year-old singer against the man she has accused of sexual assault in 2013, David Mueller, 55.
An eight-member jury has been weighing up her allegation that Mueller clutched her bare buttocks during a pre-concert fan reception, against Mueller's assertion that she falsely accused him, then got him fired from radio station KYGO-FM.
The Grammy-winning artist behind such hits as Fearless and I Knew Your Were Trouble testified on Thursday that she was subjected to a very long, "intentional" and "horrifying" grope by Mueller as she posed with him and his then-girlfriend for a picture.
Swift also said it was obvious the couple had both "had a few cocktails".
Dent, a former police officer who said he has provided security for many other celebrities, told jurors he witnessed the incident.
"I saw his hand under her skirt. ... Her skirt went up. ... She jumped," Dent testified, adding that Swift then moved closer to Mueller's girlfriend, who was standing on the other side of the singer for the photo.
"I was definitely sure that he had been drinking," Dent said of Mueller. "I don't know what level. He wasn't staggering or falling down."
Dent said he did not immediately intervene because he took his cues from Swift, who continued with the meet-and-greet session. When she finished meeting her fans Swift told her staff about the groping, Dent said.
Earlier this week, Mueller testified that he may have made innocent contact with Swift but denied any inappropriate behaviour.
The last witness called was Mueller's ex-girlfriend, Shannon Melcher, a former sales representative for KYGO.
Asked if she saw Mueller inappropriately touch Swift during the picture-taking session, Melcher said she did not, but added, "I don't have eyes in the back of my head".
"We took the photo quickly," she testified, recounting that Mueller was standing some distance away when it was their turn to pose, and that he later remarked "he had to dive into the photo".
The photo, repeatedly displayed in court, shows Swift in a black skirt and top, flanked by Mueller and Melcher, all three smiling for the camera.
Mueller has his right hand concealed behind Swift's backside, and she appears to have shifted her hip away from him.
Jurors were dismissed for the weekend, and were due to return on Monday to hear closing arguments.
Swift, known for baring her soul and her grudges in her music, gave an unflinching account of the incident in court on Thursday.
In unvarnished language that occasionally drew titters in the courtroom, even from some jurors, Swift testified that she was the victim of a "devious and sneaky act".
"Your client grabbed my ass," she told McFarland. "He stayed latched onto my bare ass cheek. I felt him grab onto my ass cheek under my skirt."
Mueller initiated the litigation, claiming Swift fabricated the story and pressured KYGO to fire him. Swift then countersued for assault and battery, asking for symbolic damages of $1.
The former disc jockey is seeking lost earnings and to clear his name, telling the court this week it was humiliating to be accused of "something so despicable".