I imagine that one of the toughest parts of being an actor is the dramatic changes you have to make to your appearance. Plenty of actors do it, from Christian Bale in The Machinist to Tom Hardy in The Dark Knight Rises - some actors have to put their bodies through hell in order to get into character. One actor who seems to undergo dramatic weight-loss and weight gains is Jonah Hill. Hill, who is known for his roles in films such as Superbad and The Wolf of Wall Street has continuously battled with his weight, leading to him regularly fluctuating between being super skinny and carrying a few extra pounds. However, not only has Jonah lost a lot of weight for his latest role, he has also completely transformed his entire appearance. The actor stars in the new movie, 'Don't Worry, He Won't Get Far On Foot', alongside Joaquin Phoenix, Rooney Mara and Jack Black, looking unrecognisable from the Jonah we are used to seeing on red carpets and on our TV screens. The film is a biopic about the dark-humoured cartoonish John Callahan. Jonah plays that character of Donnie and looks more like Kurt Cobain than the chubby, curly-haired teenager we saw in Superbad. [[youtubewidget||https://www.youtube.com/watch?v=ZYWrgLTNKP4]] Sporting long blonde hair, a big beard and wearing checked shirts, Twitter users have lost their collective mind and the actor's new looks, with plenty of them drawing the comparison to the late Nirvana frontman. [[twitterwidget||https://twitter.com/Four_Pins/status/856548975779905536]] [[twitterwidget||https://twitter.com/bjones1297/status/856576642419793920]] [[twitterwidget||https://twitter.com/fckingtony/status/856549720830902272]] [[twitterwidget||https://twitter.com/ekkooh/status/856900216695521280]] The movie is based on the autobiography of John Callahan, which is also titled: Don't Worry, He Won't Get Far On Foot. The biopic will follow the life of Callahan, an alcoholic who becomes paralysed after having a car accident and his emotional journey to solace through drawing. Donnie (Jonah's character), is a spiritual and flamboyant man who serves to remind Callahan to just 'drink water'. [[twitterwidget||https://twitter.com/mikehungry/status/953753639025246208]] However, while the film has been greeted with generally positive reviews at the Sundance festival, some people are not happy with the casting of Joaquin Phoenix as Callahan. The Ruderman Family Foundation, a foundation that campaigns for the inclusion of disabled people in society, said that they think that the casting was a 'mistake' and that it was 'unacceptable and offensive'. In a statement issued by President Jay Ruderman, the foundation said: "It was a mistake for director Gus Van Sant to cast Joaquin Phoenix in his upcoming biopic about disabled cartoonist John Callahan. The time has come for the entertainment industry to audition and cast actors with disabilities to play leading roles portraying disability. As we enter 2018, American society no longer finds it acceptable for white actors to play Black, Asian, or Hispanic characters. It is equally unacceptable and offensive for able-bodied actors to be cast inauthentically in the roles of characters with disabilities." 'Don't Worry, He Won't Get Far On Foot' is out in cinemas in May 2018 and will no doubt cause a stir for both its casting, and the transformation that Jonah Hill has gone through.

While Jonah Hill is a celebrated actor and screenwriter, it's would be fair to say that the majority of stories regarding him in recent times have surrounded his incredible body transformations. Hill appears to be one of those people who is constantly at war with his body and his weight seems to have been consistently fluctuating for the past few years.

But, while the actor may have remained popular no matter what size he is, it would be safe to say that he received a hell of a lot more of attention when he made the transition from the "chubby teenager" in Superbad to the more refined and slim man in the 21 Jump Street series.

And, if his latest post is anything to go by, it turns out that Hill has continued on his incredible transformation. Recently, the actor joined Instagram and set tongues wagging with his first upload. In the image, Jonah can be seen showing off his biceps while filming his feature-length directorial debut, Mid 90's.

The Jonah we see in the photo is pretty far from the one that we used to see adorning the big screens of the cinema. Understandably, fans of the actor rushed to Twitter to share their astonishment at the transformation, with one user asking him what the secret to his success was.

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Hill is certainly someone who undergoes serious transformations for his movies, with him looking completely unrecognisable in the trailer for Don’t Worry, He Won’t Get Far on Foot.

In the clip, the actor can be seen sporting long blonde hair, a beard and check shirts. He resembled Kurt Cobain rather than Jonah Hill and a lot of Twitter users couldn't quite get their head around it.

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In the movie, which is based on the autobiography of John Callahan - an infamous cartoonist who was left paralysed after being in a car accident - Jonah plays a character who is a flamboyant spiritual trying to get Callahan to sober up.

The movie has attracted a fair amount of criticism for casting Joaquin Phoenix to play a disabled character, with plenty of people feeling like the role should've been given to someone with an actual disability.

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Jay Ruderman, the president of The Ruderman Family Foundation released a statement on their website, which read:

"It was a mistake for director Gus Van Sant to cast Joaquin Phoenix in his upcoming biopic about disabled cartoonist John Callahan.

"The time has come for the entertainment industry to audition and cast actors with disabilities to play leading roles portraying disability.

"As we enter 2018, American society no longer finds it acceptable for white actors to play black, Asian, or Hispanic characters.

"It is equally unacceptable and offensive for able-bodied actors to be cast inauthentically in the roles of characters with disabilities."

While it's easier for celebrities to make these transformations due to the fact that they have personal trainers, personal chefs and nutritionists, you still have to respect Jonah for not only losing the weight, but also maintaining that weight loss.

Jonah Hill is pretty cool and all, but have you ever thought of him as biblical?

Hundreds of social media users have - and it's all down to one particular picture.

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When the Maniac actor uploaded a photo of himself to Instagram to celebrate the end of the year, his followers were quick to point out that he reminded them of a certain key religious figure: Jesus Christ.

The 35-year-old shared the image of himself smiling at the camera, wearing a pink shirt and blue gown, with the caption: "2018 was... interesting... be safe out there everyone."

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But it was his brand new long blonde hair that caught people's attention, with many online taking to the comment section to share their opinions.

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"Rocking that jesus look bro @jonahhill ?," wrote Instagram user @kyleforbes1988.

He was joined by @jazzflan_13, who expressed her shock by putting "Omfg u do look like Jesus. Amen ??," along with dozens of others who agreed that Jonah's new look harked back to the awaited Messiah.

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However, others weren't so sure about the whole thing, with many Instagrammers' thoughts going in a completely different direction. Rather than Jesus Christ, they insisted that Jonah looked exactly like fellow actor Jared Leto.

"I can’t tell if you look like if Jared Leto was trying to play you in a movie or if you were trying to play Jared Leto in a movie," joked @evanbulber.

He wasn't the only one who thought the 35-year-old looked exactly like the Suicide Squad star, with @darkykong writing: "Jonah Leto?"

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The comparisons just kept on coming, with certain followers deciding that Jonah's new look carried other connotations:

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Rather than get into the lookalike game, other people on Instagram simply congratulated the 21 Jump Street actor on growing such fabulous long hair. "You have such luscious golden locks you’re truly an awesomely beautiful man ?," commented Instagrammer @jporracchio.

So, does Jonah look like Jesus, Jared Leto, a weed smoker, or someone else? The options are seemingly endless!

Typical depictions of Jesus show him with long hair, blue eyes and white skin. However, experts have insisted that the Son of God's Middle Eastern roots suggest that he was far from the fair-eyed, pale-skinned chap we all recognise today.

2018 was a busy year for Jonah, with him starring in the Netflix series Maniac and making his directorial debut with Mid90s.

In 2019, he will be back on our screens playing Lewis in The Beach Bum, as well as reprising his roles as Snotlout Jorgenson in How to Train Your Dragon: The Hidden World, and Green Lantern in The Lego Movie 2: The Second Part.

Stories in which people completely transform their look can inspire us all to get in shape. In all honesty, many of us will read inspirational quotes by Instagram models and then go back to the Doritos and pizza anyway, but that doesn't mean it isn't motivational to see someone utterly change their lives for the better.

When it comes to acting, you may have to undergo something like this just for a role. There's no way they would let anyone suit up in a superhero movie without getting absolutely ripped beforehand, and for biopics often prestige actors need to slim down or pack on the pounds to match up to the body type of a real person.

For Jonah Hill, it's been a bit of both. After hitting the big time after Superbad hit theaters back in 2007, he has been in plenty of comedies and dramas that required him to be all sorts of sizes. In addition to that, he has had some problems with his own weight and eventually decided to shed some pounds.

It was actually is 21 Jump Street co-star Channing Tatum that set him on the right path with some tough love.

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Speaking on The Tonight Show to Jimmy Fallon, Hill described how he asked his always-in-shape co-star if he "ate less and go to a trainer, will I get in better shape?" Tatum then replied: "Yes, you dumb motherfucker, of course you will. It's the simplest thing in the entire world."

Hill has slimmed down once again, revealing his new look on his recently-launched Instagram account. In a photo posted last week, the actor was seen looking a lot different on the set of his directorial debut, Mid 90's.

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Even hidden behind the camera, fans were overwhelmed by how different the actor looked.

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While he works as director on the coming-of-age drama, which he also wrote, the 34-year-old has been posting even more snaps that give a clearer look at 2018's Jonah Hill. "Gonna get to know this crew very soon," he wrote in the caption. "These are my favorite actors (and co-producer)."

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Hill won't be acting in this movie, but the plot does hit close to home - following a teenage boy growing up in Los Angeles in the 90s. Rather than starring the actors you would expect to turn up in a Jonah Hill movie, such as Seth Rogen or Justin Long, the movie stars Katherine Waterston and Lucas Hedges, as well as a large cast of relative unknowns.

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And if you didn't believe these shots, thinking there might be some trickery at play, you can see it in motion in this short Instagram clip:

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There seems to be plenty of fun being had on the set of this movie. The set photographer on the production even caught images of Hill as he pulled off a kickflip, which he was clearly incredibly proud of.

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Did you also know that not only did Jonah Hill and actor Justin Long work together numerous times, but they actually lived together? You can read about that and 11 other celebrities who grew up together in this list.

Jonah Hill has been attracting a lot of attention as of late. The actor, who is somehow 34-years-old, has undergone a serious body transformation recently, with him showcasing his refined physique on his Instagram account.

After hitting the big time after starring in Superbad back in 2007, he has been in plenty of comedies and dramas that required him to be all sorts of shapes and sizes. In addition to that, Jonah has also had some problems with his own weight off-screen and eventually decided to shed some pounds.

Speaking on The Tonight Show with Jimmy Fallon, Jonah revealed that it was actually is 21 Jump Street co-star Channing Tatum that set him on the path to fitness, with some tough love being used to encourage him.

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Hill described how he asked his constantly-ripped co-star if he "ate less and go to a trainer, will I get in better shape?" Tatum then replied: "Yes, you dumb motherf****r, of course you will. It's the simplest thing in the entire world."

However, while his weight may have been grabbing the headlines recently, it's Jonah's latest tattoo that has caught the attention of his fans and the press alike.

Jonah's sister, Beanie, is also an actor and recently starred in the Oscar-nominated movie Lady Bird, as well as being in Bad Neighbours 2 and played the lead character in the Broadway production Hello, Dolly!

Jonah is famously close to his younger sister and decided to permanently mark their relationship by getting a tattoo of her name in the Hello, Dolly! font.

Jonah uploaded the photo while wearing a Hello, Dolly! baseball cap and seemed pretty pleased with himself.

Beanie also shared the photo on her account, captioning it:

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"Somebody wants to put on his Sunday clothes!!! @jonahhill – this is NEXT LEVEL. Love you!"

Fans were enamoured by the tattoo, with one user saying: "@beaniefeldstein your brother rocks! @jonahhill obviously loves you very much!! i cant help but think after having tattoos pressed on for so many months may have inspired this as well lol"

It's not the first time Jonah has posted a photo devoted to his sister on his Instagram - the actor also uploaded a very cute throwback of the duo, captioning it:

"As always, I’m copying her because she’s cooler and the leader of us two even tho she’s ten years younger. My hero and my best friend. And now she’s going to make fun of how earnest my Instagram posts are. But too bad Beanie, you taught me to be myself. And I’m sappy AF. Whatever."

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Jonah's new ink comes just three months after his brother Jordan died after developing a blood clot in his leg, resulting in a heart attack.

Jordan was the manager of Maroon 5 and died on December 23 at the age of just 40. The family released a statement the next day, reading:

"Unfortunately, last night Jordan called 911 for shortness of breath, when paramedics arrived it was determined he went into full cardiac arrest and passed away shortly thereafter.

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"His family asks for privacy during this difficult and unexpected time.

"In lieu of food and flowers, the family will announce a charity in the coming weeks where memorial donations can be made in Jordan’s name."

The tattoo may not be the most aesthetically pleasing thing I've ever seen, but it's a pretty sweet tribute to his sister.