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.

The 37-year-old British TV personality shocked The Masked Singer panelists while revealing she was Ladybug on Wednesday's episode featuring guest Triumph, The Insult Comic Dog.

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

Perry made a grand entrance out of a giant red Christmas tree ornament. She was accompanied onstage by backup dancers dressed as purple gift boxes wrapped in red patent leather bows.

She said 'yes' to marrying 5 Seconds Of Summer guitarist Michael Clifford, earlier this year.

Taylor Swift threw the 'most aggressive holiday party known to womankind,' on Friday evening for her 30th birthday.

They gained worldwide fame after their 2014 hit She Looks So Perfect. And now 5 Seconds of Summer have revealed they've been crashing Taylor Swift's birthday parties for five years.

Proving just how far they've come, Australian punk-rock band 5 Seconds Of Summer were one of the headline acts at this year's KISS 108's iHeartRadio Jingle Ball in Boston on Sunday.

He has been busy in the recording studio with his band 5SOS in the lead up to their fourth album over the past year. 

5 Seconds of Summer drummer Ashton Irwin kicked off the New Year by working up a sweat.

They are celebrating their four-year anniversary together this week.

The 24-year-old guitarist, who is engaged to model Crystal Leigh, told Fitzy & Wippa at the G'Day USA gala in Los Angeles on Saturday that he'd asked the 5SOS boys to be his groomsmen

5 Seconds of Summer guitarist Michael Clifford has reportedly snapped up a stunning $2.9million mansion in California. 

Ashton Irwin has lived away from his native Australia for more than seven years.

They're the Sydney born rockers who split their time between living LA and touring the globe.

They performed at the Fire Fight Australia bushfire relief concert on Sunday night. 

He proposed to his model girlfriend Crystal Leigh in July 2019.

The boys from 5 Seconds of Summer have revealed the bucks party they want to throw bandmate Michael Clifford, as he prepares to marry fiancée Crystal Leigh.