They're one of the hottest boy bands in the world. And the four Aussie musicians of 5 Seconds Of Summer look VERY different to when they broke onto the scene in 2011.

They're the Australian pop-rock group making waves right around the world.

Aussie pop rockers 5 Seconds of Summer rose to fame by covering tracks on YouTube back in 2011.

On Wednesday, guitarist Michael Clifford hinted at the possibility of another collaboration with the Good Charlotte boys.

And on Friday guitarist Michael Clifford revealed the four-man band will perform a series of all-ages shows across the country.

5 Seconds of Summer tell the Today show's Richard Wilkins that dealing with their level of fame is quite scary.

Orpheus Pledger led the arrivals at the Five Seconds for Summer concert at the Metro in Sydney.

Australian pop rockers 5 Seconds of Summer thrilled fans with an acoustic performance in Sydney, on Friday. 

5 Seconds Of Summer were mercilessly mocked by Twitter users for their unique accents during an appearance on The Project on Tuesday night.

Aussie pop stars 5 Seconds Of summer looked every bit the aloof rockers when they performed at the Wango Tango festival in los Angeles on Saturday

Australian pop rock band 5 Seconds of Summer have announced plans to return to the United Kingdom this autumn. The string of five shows will begin on October 23, 2018 and end on November 2, 2018.

Australian pop rockers 5 Seconds Of Summer first burst onto the music scene as teens back in 2011 before attracting worldwide attention in 2013.

5 Second Of Summer (5SOS) have become No. 1 in the US. The Australian-raised hunks' third album Youngblood topped the coveted Billboard 200 charts this week.

Australian pop rockers 5 Seconds of Summer, perform at National Sawdust festival in New York on Monday.

They're the Australian rockers with humble beginnings, hailing from Sydney's Western Suburbs. 

They're the Sydney rockers who recently took out the number one spot on the American Billboard chart with their album, Youngblood. 

5 Seconds of Summer filmed an interview for the Today show hours before kicking off their Meet You There tour of Australia in Sydney this week.

5 Seconds of Summer's Calum Hood performs bizarre leg kick in VERY tight flares during appearance on The Project

The Sydney-formed boy band have become global phenomenons since launching their group, 5 Seconds Of Summer, in 2011.

It certainly pays to be in 5 Seconds Of Summer.

5 Seconds Of Summer's Luke Hemmings and girlfriend Sierra Deaton made their relationship Instagram official back in July. 

He debuted his striking red hair on Christmas Day.

He debuted his striking red hair on Christmas Day. 

It's been quite a year for 5 Seconds Of Summer, with the band's latest album Youngblood topping the charts around the world.

They've been pictured together on several occasions since late 2017.

It's been a busy year for 5 Seconds of Summer, with their single Youngblood spending an impressive 46 weeks on the Billboard Hot 100.

They made a spectacular comeback last year with their Youngblood album and are currently promoting their new single, 'Easier'. 

It's been a busy year for 5 Seconds of Summer, with their single Youngblood spending an impressive 46 weeks on the Billboard Hot 100. 

They made a spectacular comeback last year with their Youngblood album.

They excitedly announced their engagement in January this year.

They may have been dating since 2017, but Ashton Irwin and Kaitlin Blaisdell still appear to be in the throes of newfound love.

They're one of the biggest bands to ever come out of Australia. 

The Australian musicians of 5 Seconds of Summer have been friends since they went to high school in New South Wales. And on Thursday, Ashton Irwin and Callum Hood got coffee together in LA.

It's been a busy year for 5 Seconds of Summer, with their single Youngblood spending an impressive 46 weeks on the Billboard Hot 100. 

5 Seconds of Summer's Michael Clifford politely says performing at the ARIAs was 'more exciting' than the Billboard Music Awards...seconds before he clears his throat

The 23-year-old bassist appeared to have no qualms about playing seventh wheel as he arrived for the group date at Double Bay venue The Golden Sheaf.

5SOS' Calum Hood, 23, and Ashton Irwin, 24, attended the Sydney premiere of Muriel's Wedding The Musical on Thursday.

5 Seconds Of Summer bassist Calum Hood, 23, famously landed himself in hot water when he was pictured smoking a cigarette outside a petrol station in January 2015. 

Michael Clifford treated his fiancée Crystal Leigh to a vegan feast for her birthday recently.

Calum Hood is the only member of ARIA award winning Aussie pop group 5 Seconds of Summer who is single. 

 5 Seconds of Summer frontman Luke Hemmings just celebrated his 23rd birthday, taking to Instagram to thank fans for the sweet messages

He's been hard at work recording 5 Seconds of Summer's fourth studio album.

Five Seconds Of Summer have already dropped three singles from their upcoming fourth studio album. And on Monday, 5SOS singer Luke Hemmings confirmed the band's new album is done.

The members of 5 Seconds of Summer played a risky game of Tattoo Roulette on The Late Late Show with James Corden on Friday.

 5 Seconds of Summer's singer Luke Hemmings has been happily dating girlfriend Serra Deaton since last February.

5 Seconds of Summer were left red-faced after their backstage rider was publicly revealed on NBC's A Little Late with Lilly Singh.  

They're the ARIA Award-winning rockers with millions of fans across the world. 

After arriving on Love Island as an intruder on Tuesday night, many fans of the show may have thought Biannca Rose looked familiar. It turns out this isn't the 25-year-old's first brush with TV fame.

Zayn Malik's family have been celebrating Martin Tiser's 18th birthday, weeks after he married the One Direction star's sister Safaa, 17.

He's the drummer with one of the biggest bands in Australia.