The 31-year-old Superbad actor was snapped on the set of his new comedy, Arms and the Dudes, in Burbank, Calif. on Wednesday, looking noticeably heavier than he has in recent years. Sporting a blue shirt, beige slacks, slicked-back hair and some serious self-tanner, Jonah looked almost unrecognizable.
It's unclear if Jonah's weight gain is for his new film, which tells the true story of two men who were contracted by the Pentagon to arm America's allies in Afghanistan. Directed by The Hangover director Todd Phillips, the film also stars Miles Teller, and isn't set to hit theaters until next year.
Of course, this isn't the first time Jonah's weight has fluctuated. He's dramatically dropped pounds in the past -- most notably for 2011's Moneyball. He's talked about his weight loss before, equating it with being a sign of maturity.
Jonah Hill through the years
Jonah Hill displays shocking weight gain on the set of 'Arms and the Dudes'
Jonah Hill arrives for the GQ Men Of The Year Awards 2014 at a central London venue, London, Tuesday, Sept. 2, 2014. (Photo by Jonathan Short/Invision/AP)
In this Thursday, June 5, 2014 co-stars Channing Tatum, left, and Jonah Hill, right, pose for a portrait in promotion of their new film "22 Jump Street," in New York. The film releases in the U.S. on Friday, June 13, 2014. (Photo by Victoria Will/Invision/AP)
NEW YORK, NY - JUNE 4: Jonah Hill at Good Morning America in New York City on June 4, 2014. Credit: RW/MediaPunch/IPX
Jonah Hill arrives at the 86th Oscars Nominees Luncheon, on Monday, Feb., 10, 2014 in Beverly Hills, Calif. (Photo by Jordan Strauss/Invision/AP)
Jonah Hill arrives at the 19th annual Critics' Choice Movie Awards at the Barker Hangar on Thursday, Jan. 16, 2014, in Santa Monica, Calif. (Photo by Jordan Strauss/Invision/AP)
From left, actress Jonah Hill and Roast Master Seth Rogen onstage during the Roast of James Franco at Culver Studios on Sunday, Aug. 25, 2013 in Culver City, Calif. (Photo by Paul A. Hebert/Invision/AP)
Cast member Jonah Hill attends the premiere of "The Watch" at Grauman's Chinese Theatre on Monday, July 23, 2012, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
Actor Jonah Hill arrives at the premiere of the feature film "21 Jump Street" in Los Angeles on Tuesday, March 13, 2012. (AP Photo/Dan Steinberg)
Jonah Hill arrives for the 69th Annual Golden Globe Awards Sunday, Jan. 15, 2012, in Los Angeles. (AP Photo/Matt Sayles)
Jonah Hill poses backstage at the MTV Video Music Awards on Sunday Aug. 28, 2011, in Los Angeles.(AP Photo/Chris Pizzello)
Actor Jonah Hill speaks at a panel for the television show "Allen Gregory" at the Comic-Con International 2011 convention held in San Diego Sunday, July 24, 2011. The annual comic book and popular arts convention attracts over 100,000 people and runs through Sunday July 24. (AP Photo/Denis Poroy)
Jonah Hill attends the 2011 Fox Upfront party on Monday, May 16, 2011 in New York. (AP Photo/Peter Kramer)
Actor Jonah Hill arrives at the premiere of the feature film "Cyrus" at the Los Angeles Film Festival in Los Angeles on Friday, June 18, 2010. (AP Photo/Dan Steinberg)
Actor Jonah Hill from the film Cyrus poses for a portrait at the Gibson Guitar Lounge during Sundance Film Festival in Park City, Utah on Monday, January 24, 2010. (AP Photo/Carlo Allegri)
Jonah Hill arrives at the MTV Movie Awards on Sunday May 31, 2009, in Universal City, Calif. (AP Photo/Chris Pizzello)
Actor Jonah Hill arrives to the premiere of "The Darjeeling Limited" in Beverly Hills, Calif., Thursday, Oct. 4, 2007. (AP Photo/Mark J. Terrill)
Jonah Hill arrives at the premiere of "Superbad" in Los Angeles on Monday, Aug. 13, 2007. (AP Photo/Matt Sayles)
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"Being healthier came along with maturity," he told Vulture in 2011. "And it's hard, because a lot of times people want you to be the guy you were when they met you. And I love doing funny movies, but I want to mature, literally, in how I treat myself. I'm not living in a frat house with a bong plastered to the table. ... But all this stuff [points to his body] is just part of maturing in body and in mind. I just want to be a good man and to make my family proud. And, you know, I want to live a long time."