Ragnhildur began her gymnastics career in 1991, and was recognised as the 1998 Best Gymnast. 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 Maríusdóttir and Jón Þór Harðarson, a mechanical engineer, who used to work for the Icelandic aluminium company Alcan. Ragnhildur's mother died when she was seven years old. At the age of 27, Ragnhildur started working on a youth program for RÚV-Icelandic National Television. Later she became the co-host of the primetime show Kastljós. Last year Ragnhildur was nominated one of the best Icelandic TV presenters. In August 2011, it was reported that Ragnhildur will be hosting the Icelandic version of the American TV show So You Think You Can Dance.