Roselyn is the youngest of four siblings, having three older brothers. She received her primary education in San Juan. At a young age, she showed an interest in both dancing and acting and would put on shows for her family.
In 1991, at the age of 18, Roselyn moved to New York City, where she took classes in dancing, acting and singing. She returned to Puerto Rico and in 1992, she made her movie debut, having landed a small part as an island girl in the movie Captain Ron, which was partly filmed on the island, starring Martin Short and Kurt Russell.
Roselyn has been named to numerous annual lists of beautiful women including Maxim Magazine Hot 100 in 2001,2002 and 2006; AskMen.com's Top 99 Most Desirable Women in 2005 and 2006; FHM Magazine 100 Sexiest Women in 2005 and 2006