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'
LOS ANGELES, CA - MAY 16: Jonah Hill is seen on May 16, 2017 in Los Angeles, California. (Photo by BG005/Bauer-Griffin/GC Images)
Archeological findings are pictured inside an underground tunnel in east Mosul on March 6, 2017.
Two winged bulls dating from the Assyrians empire were found in a labyrinth of narrow underground tunnels dug by the Islamic State group in east Mosul. The impressive maze of tunnels dug by the jihadists to carry out archaeological excavations is located in the heart of the hill that houses the tomb of the Prophet Jonah (Nabi Younes). / AFP PHOTO / ARIS MESSINIS (Photo credit should read ARIS MESSINIS/AFP/Getty Images)
LOS ANGELES, CA - JANUARY 29: Actor Jonah Hill speaks onstage during the 23rd Annual Screen Actors Guild Awards at The Shrine Expo Hall on January 29, 2017 in Los Angeles, California. (Photo by Kevork Djansezian/WireImage)
BEVERLY HILLS, CA - JANUARY 08: Actor Jonah Hill attends the 74th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 8, 2017 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - NOVEMBER 07: Jonah Hill is seen on November 07, 2016 in Los Angeles, California. (Photo by HIGHFIVE/Bauer-Griffin/GC Images)
LOS ANGELES, CA - DECEMBER 14: Actor Jonah Hill is seen on December 14, 2016 in Los Angeles, California. (Photo by SMXRF/Star Max/GC Images)
NEW YORK, NY - OCTOBER 08: Jonah Hill speaks at The New Yorker Festival 2016 - Jonah Hill talks with David Remnick at Acura at SIR Stage37 on October 8, 2016 in New York City. (Photo by Thos Robinson/Getty Images for The New Yorker)
BEVERLY HILLS, CA - NOVEMBER 06: Jonah Hill speaks onstage during the 20th Annual Hollywood Film Awards held at The Beverly Hilton Hotel on November 6, 2016 in Beverly Hills, California. (Photo by Michael Tran/FilmMagic)
LOS ANGELES, CA - NOVEMBER 11: Jonah Hill is seen on November 11, 2016 in Los Angeles, California. (Photo by BG012/Bauer-Griffin/GC Images)
Best actor in a supporting role nominee Jonah Hill arrives at the 86th Academy Awards nominees luncheon in Beverly Hills, California February 10, 2014. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT HEADSHOT)
Actor Jonah Hill arrives at the 19th annual Critics' Choice Movie Awards in Santa Monica, California January 16, 2014. REUTERS/Kevork Djansezian (UNITED STATES - Tags: ENTERTAINMENT) (CRITICSCHOICE-ARRIVALS)
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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."