Written by Sara Bordon, February 12, 2016

Sam Smith shocked fans and caused concern over his health this week after he posted a selfie on Instagram this week.

The 23-year-old singer shared a nearly unrecognisable snap of himself looking very thin.

California daze

A photo posted by Sam Smith (@samsmithworld) on

Sam has previously shared his struggle with weight and body image, admitting last year, ‘I saw a picture of me on New Year’s Eve topless on a beach in Sydney and it made me want to kill myself’.

‘I just thought I was huge. I’ve had issues with my weight since I was a kid… My dad became a fitness trainer when I was 12 and he tried to help me, but I’ve always had issues.’

2014 – 2015 – a lot has changed haha

A photo posted by Sam Smith (@samsmithworld) on

And although the Oscar-nominee has lost a significant amount of weight over the last few months, fans are worried.

‘OMG @samsmithworld you are too skinny!! Stay healthy!!! pls!’ a fan commented on his picture.

LOS ANGELES, CA - FEBRUARY 10: Recording artist Sam Smith attends Saint Laurent at Hollywood Palladium on February 10, 2016 in Los Angeles, California. (Photo by David Livingston/Getty Images)

‘Had to do a double take! Did NOT think this was @samsmithworld but ehh, as long as he’s healthy and happy :),’ wrote another.

Sam has credited the book Eat. Noursh. Glow. for his dramatic slimdown, saying, ‘It helped me lose over a stone [6.4kg] in two weeks and has completely transformed my relationship with food.’

But has the star taken his weight loss too far?!

RELATED: How Sam Smith lost 6.5kg in 14 days…

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