Kristian Luuk’s parents come from Estonia, and the first few years in Sweden the family lived in Sätra in Stockholm, but in 1970 the family moved to Skärholmen. His father worked for IBM, and during three years in the end of the 1970s the family lived in California, USA. Luuk studied at Estniska skolan in Stockholm, and his high school studies were conducted at Åva gymnasium in Täby. He studied civil-economy at Handelshögskolan in Stockholm, there he started getting involved in the students-radio and local radio.

For the larger audience he became known in the radio show Hassan at Sveriges Radio and Knesset at ZTV. In 1996 he started working for television at TV4 when he presented his own talk show Sen kväll med Luuk. The talk show lasted until 2004. In early 2005 he started presenting God natt, Sverige along with his current wife Carina Berg. The show was cancelled after just one season and Luuk left TV4 after that. By the help of Peter Settman Luuk got work at SVT and in late 2007 he presented the show Videokväll hos Luuk.

Luuk acted in the film Känd från TV in 2001 in a supporting role, the film was directed by Fredrik Lindström. He presented Melodifestivalen 2007 and Melodifestivalen 2008 on SVT, Sweden’s pre-selection for the Eurovision Song Contest.

In 2009 Luuk became the presenter of the popular entertainment show På spåret (along with Fredrik Lindström), after the previous presenter Ingvar Oldsberg left the show. He presented the reality series Maestro in 2011 for SVT.

In 2012 he presented the podradio show Luuk & Lokko along with his childhood friend Andres Lokko.

Luuk was married to fellow television presenter Carina Berg. The couple has one son. Luuk also has two children from previous relationships. On October 7, 2016, it was announced that Luuk and Berg were getting a divorce.