- Publish Date
- Wednesday, 9 August 2017, 12:06PM
We almost didn't recognise Sam Smith when he stepped out in London last night!
The 'Stay With Me' hitmaker, who has been keeping out of the spotlight for over a year now, showed off his astonishing weight loss as he posed for photographers at a Yves Saint Laurent party.
Since finding fame, Smith became determined to slim down and get healthier.
Working with nutritional therapist Amelia Freer - who he thanked for "changing his life" - he has since cut gluten, dairy and refined sugar out of his diet completely.
With her help, Smith lost over 6kg in just two weeks.
At the 2016 Grammy Awards he revealed: "I've just not eaten like a pig anymore – that's what I'm doing.
"It's very very difficult. I love food so much so it's a constant battle. It's always going to be a battle but I'm trying my best."
But fans are worried the 25-year-old is taking his diet too far.
"Omg what happened to your weight? You look all skin and bones," commented one concerned fan.
"How thin are you now? Omg," replied another.
While a third added: "You're too skinny now."
The singer's last few major appearances were at Coachella 2016 and at the 2016 Academy Awards.
Smith has revealed he's working on new music with Timbaland, but a release date has yet to be announced.
We hope to see more of Sam Smith soon!