Ragnhildur was born Keflavík where she lived most of her youth, excluding four years the family spent in Denmark.
[5][8] She has also hosted documentaries and worked as a scriptwriter, editor, and programme developer for RÚV,[7] and in January 2018 she was named to a newly created post as assistant director of the company.
[5][7] She hosted Söngvakeppni Sjónvarpsins 2007, the contest to decide Iceland's representation at the Eurovision Song Contest 2007,[9] and many subsequent versions of the show, and is on the board of the Icelandic organisation with primary responsibility for organising the show,[5] and is the spokesperson for Iceland at the Eurovision Song Contest.
[10] In 2017, with Edda Hermannsdóttir, she published a book of interviews on gender equality, Forystuþjóð.
[11] In 2018 Ragnhildur married the footballer Haukur Ingi Guðnason, her partner since 1996;[12] they have four children.