He was romantically linked with Kendall Jenner in 2014 when they were pictured getting into a taxi together in New York.

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.

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.

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 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.

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

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. 

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

 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.

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

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

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

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

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.

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

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

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

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.

5 Seconds of Summer fans are eagerly anticipating the band's fourth album, Calm. 

It's always sunny in California and 5 Seconds Of Summer star Ashton Irwin took advantage of the stunning winter weather in Los Angeles on Wednesday. 

5 Seconds of Summer drummer Ashton Irwin admitted he was feeling unwell earlier this week on Twitter.

5 Seconds of Summer's fourth studio album CALM has climbed to the top of the charts in Australia and the United Kingdom. 

Ashton Irwin has spoken out after 5 Seconds of Summer's new album, Calm, was 'robbed' of the No. 1 spot on the U.S. Billboard Chart this week. 

The boys from 5 Seconds of Summer have previously been accused by fans of putting on 'fake American accents.'

All four members of the Australian band 5 Seconds of Summer (5SOS) grew-up Down Under. 

His official spokesman said today that he was receiving 'updates on the coronavirus response' and spoke to Foreign Secretary Dominic Raab and Matt Hancock, the Health Secretary, yesterday.

The Prime Minister has spent a fortnight at his country retreat, Chequers, after being hospitalised with coronavirus.

The Prime Minister has been informed of the proposals for matches to be played behind closed doors. And Mr Johnson sees the resumption of live sport as key to boosting the moral of the nation.

EXCLUSIVE INTERVIEW BY OLIVER HOLT: When he returned from Rio, Sbihi's rocket trajectory began to flatten. Those astonishing ergo numbers dipped. His struggles became an open secret.

The Prime Minister told aides during a three-hour Covid-19 strategy session that doctors had given him permission to return.

The Prime Minister will return to work in Downing Street on Monday to find restlessness brewing in the Tory ranks for restrictions to be relaxed.

The former Brexit secretary David Davis said that Cummings's presence could alter the advice offered in meetings. It was last night revealed the PM's chief aide had attended Sage meetings.

Dominic Raab today blasted 'irresponsible' critics for demanding the UK government set out how it will ease the nation's coronavirus lockdown.

Phones 4U founder JOHN CAUDWELL: The lockdown has gripped our economy in a deadly embrace - one from which it may never fully recover.

Today guidance drawn up by the British Retail Consortium (BRC) and the shop workers' union Usdaw was released to help shops prepare for the reopening of the UK's high street stores.