WE THREW A FREAKING PARTY. Alberto E. Rodriguez / Getty Images Valerie Macon / AFP / Getty Images What happens when you mix Jell-O shots + flip cup + Seth Rogen + a red carpet premiere? A college rager on BuzzFeed Celeb's Facebook Live...DUH! View this post on Facebook BuzzFeed We had a blast partying alongside some of Hollywood's most hilarious stars at the premiere for Neighbors 2: Sorority Rising and let's just say — we're HUNGOVER AF. BuzzFeed (It's more of a mental hangover.) There were laughs... BuzzFeed There was fashion... BuzzFeed There were games... BuzzFeed And many a conversation regarding Zac Efron's 19 abs and counting... BuzzFeed In case you missed out on the fun, check out the video above and make sure to subscribe to BuzzFeed Celeb on Facebook for more live red carpet moments!