Former Miss Argentina of 1994, Solange Guadalupe Magnano, died from complications after cosmetic surgery to lift her buttocks, national media reported.
The 37-year-old mother of two, who has worked as a model in Europe, received an injection in her buttocks intended to restore their youthful form, the report said on Wednesday.
But after the treatment in a beauty clinic, she had to be rushed to hospital, where she died on Sunday from lung embolism and heart problems.
Magnano's family said her death was a "horrific accident". The Argentine beauty ran a modelling agency in Argentina.
Cosmetic surgery for women, and increasingly for men, is quite common in Argentina.
A CNN medical expert said that such injections can have the side effect of sending a blood clot through the body and into the pulmonary system.