Irwin fans demand Robert bring back one element from throwback photo with sister Bindi

Robert Irwin 's fans have demanded he bring back his bowl cut hairstyle after he posted a photo of himself when he was younger.

The reaction came about after Robert, 20, shared a throwback to his Instagram of himself and sister Bindi at Southbank in Brisbane 10 years ago.

The children of the late Steve Irwin are seen smiling at each other with the Wheel of Brisbane in the background.

In the original picture, 10-year-old Robert is much shorter than his older sister and he is sporting a very prominent bowl cut.

On the next slide, the picture from the present shows how much Robert has grow an with a much more cropped hairstyle.

Fans took to the comments demanding a return to the old hairstyle.

One wrote a hashtag, '#bringbackthebowl' which garnered over 700 likes.

Another fan echoed this sentiment: 'Bring the bowl cut back!'

'You should bring that haircut back,' said someone else.

'Bob, I'm sad about the haircut. I think you should go back to your bowl,' another fan remarked.

'I'm surprised you speak to your Mum after that hair appointment,' joked another.

Robert's trip down memory lane comes after it was reported he is raking in the big bucks after signing several lucrative presenting gigs, each paying hundreds of thousands of dollars and has signed on for several well-paid presenting roles.

He is one of Australia's most in-demand talents and currently hosts Channel Ten's I'm A Celebrity... Get Me Out Of Here ! Australia and fronts a QLD tourism campaign.

As well as his TV success, he is also moving more into advertising and earned $200,000 to appear in a minute-long Twisties commercial, as well as a similar pay check to appear in a Queensland tourism campaign alongside Bluey.

He also filled in this week for host Tom Gleisner on the Channel Ten comedic game show Have You Been Paying Attention?, which makes it Robert's third television gig since the Logies.