Rønne began her journalistic career at the age of 22, as a production assistant on MTV in London. On returning to Denmark, she began presenting shows such as Boogie,Dagens Danmark and Ungefair on DR1 and Rundfunk on TV 2. In 2005, Rønne was offered the chance to replace Andrea Elisabeth Rudolph as co-presenter of TV 2's Vild med dans, but rejected the offer in order to pursue a journalistic career at Danmarks Radio, working for TV Avisen alongside Dagens Danmark on 1 January 2006, before joining the team behind DR1's Aftenshowet on 1 January 2007. Having worked initially as a researcher and reporter, Rønne was appointed editor of the show on 1 August 2007, and first stood in for regular presenter Louise Wolff on 3 March 2008. She has hosted four seasons of X Factor: 2008, 2009, 2011 and 2012, but announced on 8 March 2012 that the fifth series of the show in 2012 would be her last as host. Rønne worked as editor of Fakten og Livsstil for DR Medier between 2011 and 2013, before leaving DR in 2012 to become a freelancer. DR announced on 22 May 2015 that she would return to DR as the regular presenter of Aftenshowet from 1 August. Rønne also presented DR's annual fundraising initiative Danmarks Indsamling on 6 February 2016 alongside Ulla Essendrop.
Rønne was the Danish spokesperson at the 2011 Contest, announcing the results of the combined Danish jury and public vote. She has also presented two editions of Dansk Melodi Grand Prix: in 2011 alongside Felix Smith and in 2013 alongside Sofie Lassen-Kahlke and Louise Wolff. DR announced on 4 February 2014 that Rønne would present the 2014 Contest in Copenhagen alongside Pilou Asbæk and Nikolaj Koppel.
Personal life
Rønne has been in a relationship with Mikkel Lucas Overby since the end of 2008. The couple live in a townhouse in Østerbro, just north of Copenhagen, with their two children, a boy called Nelson and a girl called Eva. She has previously been linked with actor Rune Tolsgaard and journalist Nikolaj Thomassen. Rønne is also an ambassador for the Danish Refugee Council. In October 2015, she travelled to Lebanon with fellow ambassador Jesper Christensen to witness first-hand how the organisation helps Syrian refugees in the country.