Watch Seth Rogen Rave About Costar Zac Efron's Sexy Body

04/02/2014 at 04:45 PM EDT

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Seth Rogen on Conan

Meghan Sinclair/Team Coco: Inset:Gregg DeGuire/WireImage

Zac Efron

Zac Efron

After his harsh words for Justin Bieber in March, Seth Rogen's latest late-night appearance had him doling out compliments to another former teen idol. Rogen stopped by Conan Tuesday night and could not stop raving about his Neighbors costar Zac Efron.

What drove Rogen crazy was Efron's body.

"The first time I saw him without his shirt on, my first instinct was, there was something wrong with him," the Knocked Up star told Conan O'Brien.

"We had to keep writing into the scenes that I touched his body," he added. "I would look at it and want to just reach out and touch it."

Promos for the actors' upcoming film emphasize their physical disparity – both men pose shirtless, Rogen's paunch contrasting with Efron's gym-given physique.

Neighbors hits theaters May 9.



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