The 23-year-old British singer was in Miami recently, but his painful looking sunburn wasn't the only thing that had jaws dropping -- this is the skinniest we've ever seen the "Lay Me Down" singer since he started losing weight earlier this year.
"My sun burn is SO BAD ???? Lobster viiiiiiiibes ? Just had to make this top to give it some air hahhaaaaa Lord," he wrote.
Check out how handsome Smith's looking these days!
Even the GRAMMY award winner himself is impressed with the incredible weight loss he's achieved in the last year alone. Smith has credited Amelia Freer, a nutritional therapist and author of Eat. Nourish. Glow.: 10 Easy Steps for Losing Weight, Looking Younger & Feeling Healthier, for his incredible results.
"2014 - 2015 -- a lot has changed haha," he acknowledged last week with these before and after photos.
Perhaps Smith is extra motivated these days to stay on the fitness track, given his new collaboration with Balenciaga on their upcoming Fall/Winter 2015 campaign, which he just announced last week.
In April, Smith candidly admitted that someone calling him fat actually affects him more than anti-gay slurs. "If someone called me fat, that affects me way more than someone calling me a f----t," he admitted to Australia's 60 Minutes. "I think just because I've accepted that, if someone calls me a f----t, it's like, I am gay and I'm proud to be gay so there's no issues there. If something calls you fat, that's something I want to change." Watch below: