Former The Only Way Is Essex star James, 34, shed a total of 14 stone after having gastric sleeve surgery and he showed off his slim physique as he posed in a patterned shirt and linen trousers, sharing some pictures on his Instagram Stories on Thursday.
The wedding singer was in good spirits, laughing and smiling as he stood alongside his friends in a bar on the island of Mykonos.
He later shared a video of himself basking in the warm sunshine as he was driven across the island with the roof of the car down, panning the camera around to show the beautiful views.
James has been open and honest regarding his battle with binge eating, having once tipped the scales at 27 stone before having a gastric sleeve fitted last year.
The reality star's trip to Greece comes after he recently returned to the United Kingdom after enjoying a sun-filled getaway to Spain with his pals.
James showcased his slimmed-down frame and looked happier and healthier than ever on the holiday.
He was earlier seen dancing with his ex-girlfriend Lydia Bright's lookalike sister Romana at Olivia's La Cala restaurant in Málaga.
The star, who split from Lydia, 31, in 2016 after a seven year romance, joined her younger sister at Fern Hawkins' hen do ahead of her wedding to Premier League footballer Harry Maguire.
The pair took the floor by storm, with Arg spinning Romana, 18, around the venue after his performance with The Arg Band, at the bash.
Speaking to MailOnline, he previously said his career will now be focused on his true passion and gigging with The Arg Band in Marbella is where he feels happiest.
In an exclusive interview James, who last appeared on ITVBe show TOWIE in 2018, said: 'As much as I love doing all the stuff on TV, I'm really passionate about and my bread and butter is my band and all my singing gigs.'