BRITTANY SNOW, JOHNATHON SCHAECH, MING WEN and more stars hit Hollywood Wednesday night for the premiere of their killer new slasher flick, 'Prom Night' -- and ET was there!

In theaters Friday, 'Prom Night' finds 'Hairspray' star Brittany Snow as Donna, a high school senior who finds herself fighting for her life on what is supposed to be the greatest night of her life. An obsessed killer that she thought was locked away forever returns from maximum security prison to wreak havoc during the prom, and Donna and her friends find themselves trapped in a bloody game of cat-and-mouse!