An Aussie rocker looked unrecognisable at Sydney Airport on Thursday after jetting in from Melbourne.

5 Seconds of Summer frontman Luke Hemmings stunned onlookers with his dramatic transformation after living in LA for years. 

The singer, 27, rocked blonde curly locks after bleaching his brown tresses. 

Looking worlds away from his usual glam rock aesthetic, he also donned loose baggy casual clothes.

He swamped his frame with a large striped shirt and baggy black slacks paired with a brown leather jacket. 

 Some passing fans managed to recognise Luke and pull him aside for a chat. 

5 Seconds of Summer frontman Luke Hemmings stunned onlookers with his dramatic transformation after living in LA for years 

The singer has bleached his usual brown tresses. Pictured in 2017

Nowadays, Luke lives in Los Angeles with wife Sierra Deaton following their engagement in 2021. He confirmed they married at the 81st Golden Globe Awards.

 Luke is currently on the Australian leg of his Nostalgia for a Time That Never Existed tour, with the lead vocalist performing to screaming crows in Melbourne this week.

He took to the stage at the Palais Theatre in St Kilda on Wednesday night ten years since he last performed at the venue in 2014. 

‘The last time I played here was ten years ago. I had a much better outfit on. Skinny jeans I reckon,’ he told the Beat, referencing the time he performed with his band 5SOS.

Looking worlds away from his usual glam rock aesthetic, he also donned loose baggy casual clothes 

The singer hid his eyes behind a pair of black frames 

Despite travelling without his bandmates this time around, 5SOS were recently spotted together in Europe during their world tour last year.

The Australian rock band took to the stage and smashed through their biggest hits at Campo Pequeno in Lisbon, Portugal in September.

Lead singer Luke and his bandmates Calum Hood, Ashton Irwin and Michael Clifford opted for edgy looks befitting their rock star status.

Some passing fans managed to recognise Luke and pull him aside for a chat

Luke happily posed with his legions of fans  

Luke rocked a flashy pinstripe suit while jamming out on his cherry-coloured Gibson ES-335 guitar, while guitarist Michael wore an oversized T-shirt.

The foursome only wrapped their Take My Hand World Tour in December 2022, and released their third live album, The Feeling of Falling Upwards, in April 2023.

While still a member of the band, Luke debuted his first solo studio album When Facing the Things We Turn Away From through Sony Music Australia in 2021.

After it launched to the top of the ARIA Albums Chart, Luke has now released a solo EP called Boy which debuted in April, a month before he began his current tour.