Zac Efron and Seth Rogen Make Waves at 'Neighbors' Premiere

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From left: Seth Rogen, Christopher Mintz-Plasse, Zac Efron and Halston Sage

"I wanted to make a movie where people can have a party for 90 minutes without feeling hung over the next day," said director Nicholas Stoller.

It was college all over again at Monday night's premiere of Neighbors at the Regency Village Theater in Westwood. UCLA students skipped their midterm studying as they waited anxiously on the sidelines to catch a glimpse of their favorite stars and snap selfies.

The budding "bromance" of co-stars Zac Efron, Seth Rogen and Dave Franco was evident throughout the night as they celebrated the release of their latest film and gave their fans the attention they wanted.

Starring Rogen and Rose Byrne, Neighbors tells the story of a young couple with a newborn baby whose life becomes a living hell when a rowdy fraternity moves in next door. Nude scenes, hardcore partying with drugs and alcohol as well as Efron's abs dominated the movie.

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"I wanted to make a movie where people can have a party for 90 minutes without feeling hung over the next day," said director Nicholas Stoller (Forgetting Sarah Marshall, Get Him to the Greek). "And I wanted to make it a tiny bit emotional where you can relate to it whether you just had a baby or you're graduating college."

Originally titled Townies, the project turned into Neighbors, a title pitched by Universal, according to Stoller, who held a contest on set for who could come up with a new title. The prize: a year's supply of beer.

"Normally in Seth's movies, he's combative," said co-producer Evan Goldberg. "In this, though, Rose Byrne and him are a team. They are both stupid people in a dumb mission that they shouldn't be doing. Added co-producer James Weaver, "[Rogen] is an adult in the movie, which people are talking about. Zac is the kid, and Seth is doing adult things."

While shooting a party scene, Efron broke his hand in a fight scene with co-star Franco. "He was acting hard; he was a little method," said Weaver.

"I do know this guy," said Efron on how he got into his role. "He's a version of several of my best friends and different shades. I've been around a guy a lot like this."

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Added Rogen with a chuckle: "Babies are not fans of me either, and we made sure they were fine by me before we casted. These babies were good, but most I'm not cool with."

Comedian Ike Barinholtz, Halston Sage, Franco with older brother Tom Franco, Christopher Mintz-Plasse, NBC’s Brian Williams and Joseph Gordon-Levitt also attended the premiere.

After the movie, stars and guests headed to the Hammer Museum for a fraternity-themed afterparty with jello shots, beer pong and Cornhole.

Neighbors moves into theaters May 9.