Mark Wahlberg has revealed how he gained 30 pounds ahead of his role in the upcoming film, Father Stu.

The new film is a biopic about Father Stuart Long, a former boxer who went on to become a priest.

The 49-year-old Wahlberg posted a sneak preview of his new "dad bod" on Instagram, saying that his weight gain is all thanks to his private chef.

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In the caption, the actor said: "From left photo 3 weeks ago to this, now. Thanks to @chef_lawrence_d cooking."

Wahlberg previously said that he planned to gain around 30 pounds in six weeks to portray Father Stu and told Jimmy Kimmel Live!, "I want to go bakeries. I want to go to Denny's. I want to get pancakes. I want to get everything I can possibly get my hands on."

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Commenting on Wahlberg's Instagram post, his wife, Rhea, said: "And it looks just as hot in person baby."

Fellow actor Mario Lopez commented on the picture, saying: "Yo. You wear mad chubby well homie!"