"Project X" premiere in Los Angeles (28 images)

Cast member Alexis Knapp attends the premiere of the film "Project X" at the Grauman's Chinese Theatre in the Hollywood section of Los Angeles on February 29, 2012. UPI/Phil McCarten

Actor Chris Masterson attends the premiere of the film "Project X" at the Grauman's Chinese Theatre in the Hollywood section of Los Angeles on February 29, 2012. UPI/Phil McCarten

Actress Sasha Grey attends the premiere of the film "Project X" at the Grauman's Chinese Theatre in the Hollywood section of Los Angeles on February 29, 2012. UPI/Phil McCarten

Producer Todd Phillips attends the premiere of the film "Project X" at the Grauman's Chinese Theatre in the Hollywood section of Los Angeles on February 29, 2012. UPI/Phil McCarten