Jonah Hill's looking completely unrecognisable in the trailer for new film Don't Worry, He Won't Get Far On Foot, where he's seen sporting a surprising combo of a beard and long, blond hair.
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Based on a memoir of the same name, Don't Worry, He Won't Get Far On Foot is a biopic about John Callahan, the quadriplegic cartoonist who became paralysed after a car accident.
The film is directed by veteran filmmaker Gus Van Zant, and stars Joaquin Phoenix as Callahan alongside Rooney Mara, Jack Black and others.
Hill, meanwhile, plays Donnie, the flamboyant leader of Callahan's Alcoholics Anonymous group, who refers to the members as 'piglets'. And in having morphed himself into the eccentric character, Jonah's donned not only a beard, but also some very unfamiliar long blonde locks.
Of course, it's not the first time Jonah's taken on a drastic new look for a role.
In 2013's Wolf of Wall Street - where Jonah famously took a multi-million dollar pay cut just to work with Martin Scorsese - he became lewd, party-loving stockbroker Donnie Azoff, adopting giant, shiny veneers, a lisp and even, at one point, a prosthetic penis.
He also said he had to snort so much fake cocaine that he gave himself bronchitis.
"We were literally doing fake coke for, like, seven months, every day," he said on US talk show Any Given Wednesday with Bill Simmons. "I never had more vitamin D in my entire life; I could have lifted a car over my fucking head."
Hill also gained a great deal of weight to play arms dealer Efraim Diveroli, Miles Teller's business partner in 2016 flick War Dogs, which details the true story of two young men who won a $300 million (£214 million) US Army contract to supply arms to Afghanistan.
Then, of course, there's been several times where he's been photographed showing off a slimmer, trimmer physique, including during his Moneyball or Jump Street days.
More recently, though, he's looking especially lean, having slimmed down the old-fashioned way: dieting and cutting out beer.
He told ABS News: "It was mostly diet. 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 and to change my habits and stuff.
"I found that Japanese food was very helpful to me."
And yet, in spite of that, we still can't think of him without seeing the goofy, curly-haired guy that we know from the likes ofThe 40-Year-Old Virgin, Knocked Up and Superbad - which means it'll always be a surprise to see him resembling anything else.
After premiering at Sundance Film Festival a few days ago, Don't Worry, He Won't Get Far On Foot is out this May.
Featured Image Credit: PA