“Just a pic of me self isolating #washyourhands,” he captioned the risqué pic.
Many fans were quick to applaud the star for the revealing snap, however others were less than impressed.
“It’s a very very serious health issue. Very cute but people need to be taking appropriate measures,” wrote Instagrammer @emmasophie59.
However Jack was quick to respond.
“I absolutely agree and have been sharing a lot of useful information about what’s going on in my stories - but we can still have a laugh amidst all the panic xx big love and stay safe,” he wrote.
Also posting on Instagram Stories, Jack shared a candid clip of himself lounging around on his bed on day two of isolation.
'Live footage of me on day two of self-isolation,' Jack captioned the video of himself posing in a long, blonde wig.
Last month, Jack – who is famous for his dramatic cosmetic transformation since bursting onto the scene as a fresh-faced 14-year-old – revealed exactly how much surgery he has undergone.
Speaking on the Not Here To Make Friends podcast, he admitted to having his first Botox injections when he was just 19-years-old.
'I think I got it first when I was 19. I had these two creases in my forehead… I just tried it and they went away,' the Australia’s Got Talent winner said.
In fact, since 2011, Jack confessed to having Botox, lip fillers and veneers – admitting he had his teeth fixed because he had the money and thought 'why not?'
The Voice star has also preciously spoken out about getting lip fillers, saying that he's found 'security' and 'confidence' after getting the enhancements.