Espinosa won for her single "Stone Cold Sober."
The event welcomed Courtney Love, Frank Langella, Gay Talese, Barbara Walters, and more to the Delacorte Theater.
Espinosa's nominated single "Stone Cold Sober" is featured on her debut solo album Look Around.
Former Wicked Star Eden Espinosa to Perform at Musical Mondays Los Angeles
Nominees for the 2014 WhatsOnStage Awards will be announced December 6.
Broadway's hottest rock stars hit the stage to support The PATH Fund.
Producers Harriet Newman Leve and Adam Blanshay will also be honored at the centennial celebration.