Darren Criss Singing 'Teenage Dream' Live With Katy Perry

Stars including Katy Perry, Jessica Alba and Emma Stone flocked to the Hollywood Palladium in California on Sunday, December 5 to help raise money for a suicide prevention organization. Perry took to the stage with "Glee" star Darren Criss to perform a duet of her hit "Teenage Dream", while Alba and funnyman Justin Long spoke to the crowd as part of the Trevor Project's annual Trevor Live