He is about to celebrate ten years on-air with his Today Show co-host Lisa Wilkinson.
Karl Stefanovic popped into Nova's Kate, Tim and Marty Show on Tuesday, where he admitted to having a a tattoo that has become associated with Australia's 'bogan' subculture - the Southern Cross.
The admission came after Karl and hosts Kate Ritchie, Marty Sheargold and Tim Blackwell were discussing Kate's wealth after Karl spotted a Hermes watch on her wrist.
The conversation moved on to the types of after school snacks everyone ate - from cheese sticks to LeSnacks.
When the radio trio pressed Karl, he added that the tattoo formed part of a 'confusing' foursome of body art.
'On my back. On my back shoulder with a dragon and a moat...and a knife,' Karl replied.
'That's just confusing - that's the Serbian influence, ' Marty said in reference to Karl's heritage.
Karl also admitted on-air that his father changed the family name to make it sound more Australian.
'Is there a Serbian version of Stefanovic? have we tidied it up for the Anglo world we live in?' Marty asked.
'Yeah we have,' Karl replied. 'Stefarnonovitch. Sounds more credible doesn't it,' and when Marty asked if the orginal surname caused problems for young Karl at school, the today host added an emphatic yes.
'It did', he said. ' That's why dad changed it to Stefanovic. it sounded more Australian.