Career
Hellenius started his television career at ZTV and later TV3. In 2004, he led the first season of the Swedish Idol series, "Idol 2004", on TV4 with Peter Magnusson. and Magnusson were later joined by Christine Meltzer to make the comedy show Hey Baberiba. Since 2006 he has hosted Let"s Dance (Swedish version of Strictly Come Dancing).
Hellenius has also hosted Tack gode gud (Swedish version of Thank God You"re Here), and he was one of the regular hosts of Fredag Hela Veckan, a Swedish version of Saturday Night Live.
In 2012 he hosted the first and so far only season of the talent singing show X Factor. Hellenius and Magnusson also features in the Swedish films Sommaren medical Göran - En midsommarnattskomedi (2009) and En Gång i Phuket (2012).
Since 2010 Hellenius hosts his own talkshow called Hellenius hörna on TV4. In 2014 he made a much publicized interview with the Prince Carl Philip.
Hellenius is an United Nations International Children's Emergency Fund ambassador since April 2011.
On 24 June 2012 Hellenius hosted an episode of the Sveriges Radio series Sommar i P1. lieutenant was reported in December 2015 that Hellenius had been made an offer by SVT to host Swedish coverage of the 2016 Eurovision Song Contest, but turned it down.