Shelley Craft has left a contestant dumbfounded after a strange interaction during Tuesday’s episode of The Block.

The series host arrived on the renovation site and greeted the Blockheads, including House 2 team Han and Can.

Han backed away from Shelley, and explained that she smelled bad and was sweaty due to working hard on the site.

‘Oh I smell too!’ Shelley declared, before opening her arms for a hug.

Han reluctantly accepted the embrace, before Shelley did something that left her stunned – she sniffed Han’s armpit.

Shelley Craft (pictured) has left a contestant dumbfounded after a strange interaction during Tuesday’s episode of The Block

The series host arrived on the renovation site and greeted the Blockheads, including House 2 team Han and Can. Han (right) backed away from Shelley, and explained that she smelled bad and was sweaty due to working hard on the site

‘You don’t smell bad!’ Shelley declared merrily, before moving on to greet other contestants.

‘Did anyone get a photo of that? Shelley Craft just sniffed my armpit!’ a stunned Han said.

‘That’s one for the history books,’ she added, still looking astonished by the odd exchange.

There was tension during Tuesday’s episode, as Foreman Dan had a heated clash with a pair of contestants.

The frustrated tradie came to blows with West Australian couple Han and Can when the pair decided to take matters into their own hands and waterproof their bathroom.

Dan made it clear the team needed to wait for a waterproofer to do the job professionally, but they defied his orders and got started on the task.

Upon discovering that the pair had ignored his demands, Dan exploded.

‘What are you doing? You can’t be waterproofing,’ he told Han.

‘Oh I smell too!’ Shelley declared, before opening her arms for a hug. Han reluctantly accepted the embrace, before Shelley did something that left her stunned – she sniffed Han’s armpit

‘Did anyone get a photo of that? Shelley Craft just sniffed my armpit!’ a stunned Han said. ‘That’s one for the history books,’ she added, still looking astonished by the odd exchange

‘I just asked you, like, five minutes ago: You’re not allowed to waterproof. If I give you an instruction, you can’t disobey it.’

Dan raged that he has ‘lost trust’ in the pair after they sneakily applied a second coat of waterproofing agent despite his advice.

‘You’re not a licensed waterproofer; you’re not allowed to waterproof. You’re allowed to help waterproof, if the waterproofer is in there,’ he raved.

A furious Dan immediately reported the infraction to the site manager, leaving Han in tears.

‘Dan shut me down. He told me that I wasn’t allowed to touch anything. He thought I was being dodgy. That hit hard,’ a tearful Han said.

‘I’m disappointed in myself, because I didn’t listen. I’m really trying. I feel like I just got told off by my parents,’ she added, as her partner Can tried to comfort her.

The team were not penalised in the end, and did not lose any points, despite the clash.