Humble and shy. That’s the self-assessment of debutant Young Rich Lister Adrian Portelli, who made international headlines in May by craning his $3 million supercar into the loungeroom of his $39 million Melbourne penthouse.

The 34-year-old Australian entrepreneur first grabbed the spotlight late last year when he turned up to the finale of Channel Nine’s The Block driving a bright yellow Lamborghini and bidding $5.5 million for the winning house. (He was outbid, but then paid $4.25 million cash for the runner-up’s house.) And yet, he insists he’s an introvert.