The funnyman recalled the beginning of his career during an interview with Playboy contributing editor and his good pal, James Franco, noting that his fame skyrocketed after starring in the Judd Apatow comedy Superbad.
And that's partially thanks to Hill's "arranged marriage" with his costar Cera, which helped the duo build chemistry before they began filming.
"I kept thanking Judd, and he said, 'It's all good. Call Michael Cera. You're going to spend every waking second together until we shoot this,'" the actor told Franco.
"Michael and I had an arranged marriage all summer. We would hang out at my apartment, go to Canter's, play video games, mack on girls at the mall."
Hill also shared that the opportunity to star in the film came at a moment's notice. "They were casting Superbad while we were filming [Knocked Up] and couldn't figure out who would play opposite Michael Cera. Judd looked at me one day and said, 'Jonah—shave. Here's a camcorder; read this scene with Seth Rogen.'
"We shot it right there in Seth's trailer, and I got the part. It happened in 20 minutes. It was crazy. Within literally three seconds my agents and everyone started calling me."
The celeb shared that his career wouldn't be where it is today if it weren't for Rogen and Apatow.
"Meeting Judd Apatow and Seth Rogen was the tipping point. They liked my improvisations in my audition for The 40 Year Old Virgin, and I knew they were developing a more realistic place in comedy, which was something I wanted to be a part of."
He later added, "If those guys need me, I'm there. They've been there for me as people. I support them in whatever they do. They are just guys who work hard, have so much talent and are good people, and that's rare."