Windslowe said Rose told her friends and soon a stream of celebrities or their significant others were setting up appointments. The singer Chris Brown's girlfriend got injections, and the rapper and American Idol judge Nicki Minaj was supposed to but never made it, she added.
Details were sketchy, such as the name of Brown's girlfriend, and when and where Windslowe performed the procedures.
Pressed by Assistant District Attorney Carlos Vega, Windslowe said she injected Rose, now 31, while she was dating the rapper Kanye West.
It was shortly before the Feb. 8, 2011, death of dancer Claudia Aderotimi, Windslowe testified, that she injected Rose at a Doubletree Hotel in Philadelphia. West dropped her off for one appointment, she said.
Vega asked Windslowe why a woman dating a multimillionaire would choose a person who did buttocks injections in hotel rooms, rather than a famous plastic surgeon.
Windslowe, who has said she was called the "Michelangelo of buttocks injections," replied: "I'm the best."
Rose's representatives could not be reached for comment.
Windslowe was often combative during a full day on the witness stand, most of it in cross-examination by Vega, considered one of the most aggressive interrogators in the District Attorney's Office.
At one point, Vega asked Windslowe how many cellphones she had. Windslowe asked for a time frame.
"The year you killed Claudia," Vega answered, and Windslowe reacted as if she had been slapped in the face.
"You are so mean, Carlos, you are so mean. You have a nerve," she said.
Vega will continue his cross-examination when the trial resumes Monday.
Windslowe, 43, is charged with third-degree murder in the death of Aderotimi, a 20-year-old dancer who flew from London to Philadelphia for Windslowe to do buttocks-enhancement injections in an airport hotel room.
The autopsy showed silicone injected in Aderotimi's buttocks moved through her bloodstream and lodged in her lungs, brain, and liver with fatal results.
Windslowe is also charged with aggravated assault for injecting 23-year-old stripper Sherkeeia King in February 2012 at a "pumping party" in East Germantown.
King was hospitalized, vomiting blood and gasping for air; doctors found silicone in her heart and lungs.
Medical experts have testified that liquid silicone is no longer injected in cosmetic procedures because of its tendency to migrate through the body.
Windslowe has acknowledged that she had no formal medical training but said she was taught to do buttocks injections by a nurse in Manhattan who gave her silicone injections.
Windslowe told the Common Pleas Court jury she had performed thousands of buttocks injections since 1995 and never heard of any problems before Aderotimi's death.