Adrian ‘Mr Lambo’ Portelli made a shock confession on Monday about what goes on behind the scenes of The Block, admitting the auction was rigged.

The billionaire businessman, 35, who made history on Sunday night when he snapped up every Block home on Phillip Island for $15.03million, told Nova’s Jase & Lauren the auction order was pre-determined.

‘We hand-selected the auction order to make sure the girls [Maddy and Charlotte Harry] went last. So we can get them to win,’ Portelli began.

The Harry sisters became the youngest-ever auction winners of The Block, taking home an eye-watering $1.65million profit on Sunday night’s nail-biting finale, with their renovated Phillip Island property selling for $3.5million.

Portelli revealed it was decided their house would be the last to go to auction, in order to increase the drama.

‘The girls cared. They came in late. They were the underdogs, were picked on, were bullied.’

He said Marry and Charlotte were informed in advance as to why their property would be auctioned last, adding the other contestants were kept in the dark.

‘It was just the girls [who were in on the plan]. How good is that? They are the sweetest and innocent and were playing the game the best.’

Adrian ‘Mr Lambo’ Portelli made a shock confession on Monday about what goes on behind the scenes of The Block, admitting the auction was rigged. Pictured with contestants Maddy and Charlotte Harry

Maddy, 24, and Charlotte, 22, also took home an extra $100,000 for their monumental victory, on their four-bedroom, three-bathroom home which had a $1.85million reserve.

‘We are just so grateful, it’s a very surreal feeling. I’m so proud of both of us and how hard we worked,’ said Maddy of their win.

Charlotte added: ‘To end The Block on such a high note is so special. We never thought it would go like this. I could not have had this experience with anyone but Maddy.’

The Sydney sisters entered into the heated 20th season midway through filming, after couple Paige Beechey and Jesse Maguire threw down their tools.

The billionaire businessman, 35, who made history on Sunday night when he snapped up every Block home on Phillip Island for $15.03million, told Nova’s Jase & Lauren the auction order was pre-determined

He said Marry and Charlotte were informed in advance as to why their property would be auctioned last, adding the other contestants were kept in the dark. Pictured: Their winning property

Despite their eventful entrance into the competition, they certainly made an impression with their finished house as they nabbed an impressive bid.

It comes after Portelli revealed his shock plan for ‘Block Island’ after purchasing all five of the contestants’ homes during auction day.

He revealed he will be giving away all the houses in a massive ‘resort giveaway’ through his LMCT+ raffle business.

‘Under new management! And as mayor of Portelli town, I would like to announce a world first. LET’S GIVE AWAY A FKN RESORT!’ Adrian captioned his post on Facebook.

Pictured: Lauren Phillips, as Portelli admitted the details of his plan on-air of her Nova breakfast show

‘1 Giveaway – 1 Prize – Winner takes the whole resort OR $8,000,000 instant Tax-Free Cash instead! Let the game begin.’

Accompanying the announcement was a photo of Portelli posing alongside one of his lavish cars inside the Block complex he just purchased.

He was all smiles as he leaned back against his vehicle holding an LMCT+ banner with a ‘No Vacancy’ sign artfully captured in the image.

The ‘rewards club’ Portelli has made his billions from sees his customers pay for different tiers of membership to receive a number of entries in luxury giveaways.

It comes after Portelli revealed his shock plan for ‘Block Island’ after purchasing all five of the contestants’ homes during auction day. Pictured: Portelli’s business’ Facebook post

Portelli has been buying up Block houses over the last three seasons and giving them away in his raffles.

He confessed to The Kyle and Jackie O Show on Monday morning that he doesn’t even like Phillip Island and that is why he will be giving all five properties, packaged as a ‘resort’, away in the raffle.

The shock admission came when host Jackie ‘O’ Henderson asked the entrepreneur: ‘So what are you going to do with all these houses, Adrian?’

‘Well, I was thinking of starting my own resort, but I’m actually going to give them away to one of my customers,’ Adrian responded.

Kyle Sandilands explained: ‘That’s what he does. Every time he buys these houses he gives them away to one of his customers… It’s part of a contest [LMCT+].’

‘We give them away and someone gets to win it,’ Adrian said, before slamming the location where The Block was filmed this year.

‘I’m not much of a fan of Phillip Island. It’s a bit of a drive for me. I can’t be bothered to drive all that way,’ he said.