EXCLUSIVE: Zac Efron and Seth Rogen Talk Buff Bods and Sorority Sisters on 'Neighbors 2' Set

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They may have played enemies in 2014’s Neighbors, but in the upcoming sequel Seth Rogen and Zac Efron are teaming up to take down a sorority.

Don’t worry though, ET was first on set of the new film, Neighbors 2: Sorority Rising, and Efron still spends a good chunk of the movie shirtless!

“Zac does Zac,” Rogen joked when asked about his co-star’s buff bod and workout routines. “It annoys him more than it annoys me.”

WATCH: Zac Efron Shamelessly Adjusts His Package on 'Neighbors 2' Set

Chloe Grace Moretz joins the cast this time around, as the head of the rival sorority who moves in next door to Rogen, and she reassured fans that the girls won’t be pulling any punches.

“They always say boys are scarier than girls,” Moretz said of the Greek showdown during the filming of a pivotal action scene. “But when you see what we’re doing right now, you realize very quickly that having a herd of women chasing Seth Rogen down a tailgate is much scarier.”

Rose Byrne returns as Rogen’s wife in the sequel, though she had to have her real-life pregnancy worked into the film’s storyline.

“They kind of wrote it in, she was going to be pregnant later,” the actress revealed of her character. “Then they just worked it out. I was lucky.”

PHOTOS: Shirtless Zac Efron Shows Off 8-Pack on 'Neighbors 2' Set

Selena Gomez also stars in the film as a sorority queen bee, and Rogen dubbed his surprise co-star “really cool.”

“She’s awesome,” Efron agreed. “She’s super talented.”

WATCH: Selena Gomez Rocks a Skin-Tight Pink Dress on the Set of 'Neighbors 2'