Zac Efron and Seth Rogen teamed up again for "Neighbors 2: Sorority Rising" in Atlanta, a comedy due out in May that also starred Chloë Grace Moretz, Rose Byrne, Selena Gomez and Dave Franco.
"It was really fun," Rogen said during a visit to "The Ellen Show."
He was mortified at having to appear shirtless next to his hunky co-star in one scene - and he revealed the one thing Zac couldn't do while the movie was filming.
"I have to be shirtless next to him and it’s horrible. It’s just horrible," Rogen lamented. "It’s basically your worst nightmare and the only moments where it’s ok is like every once in a while like on set when we’re shooting pizza will be delivered and he actually can’t eat it."
Apparently pizza isn't part of Zac's impressive fitness plan. Rogen recalled relishing a slice while Zac could only watch.
"He gets like a sad look on his face. And those are the moments where you’re like I win this round, Efron. But he’ll live 30 years longer than I will!"
Rogen also discussed his tiff with Justin Bieber and how they finally made up. Here's the video: