He has wowed fans in recent weeks with his jaw-dropping weight loss.

And Jonah Hill appeared to be keeping up his new healthy lifestyle on Friday as he was spotted heading to the gym in Los Angeles.

The actor, 33, displayed his impressively slim frame in casual fitness wear as he headed inside to embark on another gruelling workout.

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Newly-slim: Jonah Hill appeared to be keeping up his new healthy lifestyle on Friday as he was spotted heading to the gym in Los Angeles

The 22 Jump Street star looked almost unrecognisable compared to his former self as he displayed his newly-slim figure on the way to work up a sweat.

Clad in loose-fitting navy T-shirt and shorts, the actor kept things casual as he headed inside from the LA sunshine, with a white cap protecting his head.

Clearly pumping himself up for the session, Jonah also carried an iced coffee with him for a quick pick-me-up before embarking on his workout.

Let's do this: Clad in loose-fitting navy T-shirt and shorts, the actor kept things casual as he headed inside from the LA sunshine, with a white cap protecting his head

The Oscar-nominated actor's weight has fluctuated dramatically over the years, but he has looked more trim than ever in recent weeks.

Jonah first embarked on his slim down last year following the release of War Dogs - which saw him sport a much fuller figure opposite co-star Miles Teller.

Speaking to ABC News recently, the actor admitted that it was a simple overhaul of his lifestyle which caused him to shed the pounds, rather than any fad.

He said: 'It was just mostly diet.'

Transformed: The 22 Jump Street star looked almost unrecognisable compared to his former self (R) as he displayed his newly-slim figure on the way to work up a sweat

'I wish there was some crazy thing that I did, like a pill or a genie or something, but I went to see a nutritionist, and he told me what to eat to change my habits and stuff.'

However, the Wolf of Wall Street star went on to admit that beer is his main vice - and that he has struggled to cut it out of his healthy diet completely.

He told Kyle and Jackie O radio show last month: 'I went to a nutritionist and I said, 'I'll lose weight, I'll eat healthier and whatever, but figure out how I can drink beer'.'

Beginning: Jonah first embarked on his slim down last year following the release of War Dogs - which saw him sport a much fuller figure opposite co-star Miles Teller (above)

'It's so annoying because if I don't drink beer, I get really really thin. Then when I drink beer, I get a little bigger.'

As well as his personal successes, Jonah's career is also going from strength to strength - with him currently filming comedy Don't Worry, He Won't Get Far on Foot.

The film, directed by Gus Van Sant, tells the story of a man who became a quadriplegic at the age of 21, but went on to become a top cartoonist.

It is based on the memoir of artists John Callahan, who passed away in 2010 due to complications with his disability.

The flick also Joaquin Phoenix and Rooney Mara, and is set for release in 2018.