A four-year-old Ed Sheeran fan threw quite the tantrum on Aussie breakfast show Sunrise this morning.

The young fella, Josh Cooper, was present at the Ed Sheeran pop-up store in Sydney this morning where Sunrise presenter Sam Mac was doing his weather reports.

Josh is such a big fan of the Shape of You singer that he mimics Sheeran's movements and happily performed in the background during a couple of Sam Mac's live crosses.

But things got a little heated when the Channel Seven presenter tried to give the youngster a free Ed Sheeran hat, placing it on his head as he was performing.

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Josh immediately dropped his guitar and ripped the hat off his head, throwing it into the crowd of onlookers.

A surprised Sam Mac then picked up the hat and put it on Josh's microphone stand, but once again the pint sized singer was less than impressed and hurled the hat away.

"It's a rock star tantrum," Sam Armytage said as she watched Josh's behaviour from the Sunrise studio.

Speaking to news.com.au about the hilarious segment, Sam Mac said, "what a little legend. Rock n Roll 'til the end. I guess I broke rule No. 1 of dealing with a global superstar — under no circumstances do you ever touch the hair".