'What is Justin Bieber doing playing football at my old school?' World-famous popstar, 22, drops in for a kickabout with London schoolchildren 

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He's one of the world's biggest megastars with millions of pounds to his name and a jetset lifestyle to boot.

But Justin Bieber didn't appear to let fame go to his head today when he casually dropped into a north London school for a kickabout.

The 22-year-old Canadian pop sensation, who is worth an estimated £165million ($200 million), turned up at Highgate School and played football with some pupils.

Dressed low-key in a pair of grey skinny jeans, a waterproof coat and orange trainers, the world-famous singer joined in for a quick PE session.

Megastar Justin Bieber, 22, who is worth an estimated £165million, turned up at Highgate School in north London today to play football with some shocked pupils (pictured above)

The singer (centre) dropped into Highgate School for a kickabout with some of its pupils

His appearance sent many fans at the school into overdrive, with many shocked to see the four-times number one artist at the £20,000-a-year school.

Rachel Kiki wrote: 'I'm screaming JUSTIN BIEBER just turned up + played football with all my mates. Why is he here and why did he want to play with us.'

Another pupil wrote: 'Justin randomly showed up at a school in London to play football I want to die.'

One added: 'Justin f****** Bieber was at/is at my old school in London playing football on the field. I swear the world hates me'.

And Bea said: 'No way did Justin Bieber play football with the boys from my school'. 

Others appeared upset they had missed their chance to get a glimpse of the superstar.

Jessie Amado wrote: 'Ummm why was Justin Bieber playing football at Highgate School today???'

The 22-year-old Canadian pop sensation, who is worth an estimated £165million ($200 million), turned up at Highgate School and played football with some pupils. He is seen left 

Bieber (pictured centre holding the football) posed with the class after the impromptu session

Twitter users were shocked to see the megastar turn up at the north London school today

Solace added: 'I can't believe Justin Bieber went to Highgate to play football'.

And Marcus said: 'Lol Justin Bieber played football at my old school today, 3 weeks into me being at uni :')'

Sharing an image of the singer-songwriter walking onto the sports field holding a football alongside a PE teacher, one Twitter user wrote: 'Justin f****** Bieber playing football at Highgate.'

Another pupil shared a short video clip of the megastar taking, and scoring, a penalty. 

He smashed it into the top of the net as one pupil ran towards the camera in delight.

It is not known why Bieber dropped into the school for a kickabout this afternoon, or whether it was a planned visit. 

A video has emerged showing the popstar taking, and scoring, a penalty on the school field

However, many pupils seemed shocked to see him - suggesting it may have been a last-minute visit or kept heavily under-wraps.

One Twitter user wrote: 'What the f****** f***. Justin Bieber drove past my school and wanted to play football SO HE PLAYED football. W THE Y13S IM .?.!' 

Bieber is currently in the capital for a three-night stint at the O2 Arena as part of his UK 'Purpose' tour.

The best-selling male Canadian artist, who has more than 100million sales to his name, flew into Luton Airport on a private jet on Monday afternoon.

Sporting a new close-cropped hairstyle, he held his copy of Occupy All Streets while he greeted ground staff at the airport. 

Beiber and his security guard, who was carrying a small dog, then waited together at the airport before heading in to passport control. 

Others appeared upset they had missed their chance to get a glimpse of the superstar

As well as performing in London, the popstar will also head to Birmingham, Manchester and Glasgow before jetting off to Europe in November. 

He then returns to the O2 Arena for two more nights towards the end of the month.

His casual appearance in Highgate today comes just a week after he sported a bizarre disguise while stepping out for coffee in Amsterdam.

The star donned a 70s-style moustache, a goatee beard and a windswept wig – but managed to draw more attention to himself. 

Bieber looked relaxed ahead of his UK tour as he stepped off his private jet at Luton on Monday

The Sorry singer, 22, kept things casual in skinny jeans, trainers and a jumper as he flew in

Sporting a close-cropped hairstyle, Justin held his copy of Occupy All Streets at the airport

He accessorised with an earring and showed a glimpse of his tattoos with his sleeve rolled up

The Sorry singer combined the suspect disguise with a pair of aviators, a red and black flannel shirt, plain white Tee, chinos and espadrilles.

Joined by his security guard, he even approached some girls and asked, 'Does this look real?', pretty much giving the game away.

He sat at the counter of a coffee shop as he waited for his beverage before walking back outside where people tried to get pictures of the star.

His distinctive neck tattoos, which include a large pair of angel wings, were clearly visible. 

'Does this look real?' Bieber, 22, wore a bizarre disguise as he stepped out in Amsterdam