Samanta Brans (July 17, 1980, Buenos Aires, Argentina), known artistically as Karyn Bayres, is an Argentinian bodybuilder and pornographic actress.

Samanta Brans was born in the city of Buenos Aires, Argentina, on July 17, 1980. At the age of 21, while on a work trip to Mexico, she began a romantic relationship with a trainer, who introduced her to the world of Weightlifting. She participated in her first fitness championship in 2006, since then she has been training six days a week. She adopted the stage name Karyn Bayres for the Bodybuilding competitions in which she frequently participates, in Spain. In 2014, she performed her first porn scene for the company Cumloader, and subsequently, she performed four more scenes for the production company that same year. The following year, she performed a scene together with Jordi El Niño Polla for FAKings. In 2016, she participated in a scene for the production company Evil Angel, together with Nacho Vidal, launching her to fame. Karyn performed her last scene in 2018, however, she has not officially retired from bodybuilding or pornography.