Ragnhildur is the co-host of Sjónvarpið's top-rated primetime news/talk show Kastljós. She completed an undergraduate degree in physiotherapy at the University of Iceland. She also hosted Söngvakeppni Sjónvarpsins 2007, a contest to decide who represented Iceland at the Eurovision Song Contest 2007. In recent years, she has been the spokesperson for Iceland at the Eurovision Song Contest. She is the only child of Ragnhildur Steinunn Maríusardóttir and Jón Þór Harðarson, a mechanical engineer, who used to work for the Icelandic aluminium Alcan. Ragnhildur's mother died when she was 7 years old. At the age of 23, Ragnhildur started working on a youth program for RÚV-Icelandic National Television. Her impetus and logical truth soon fascinated everyone and she became the co-host of the primetime show Kastljos. Last year Ragnhildur was nominated one of the best Icelandic TV presenters.