The 33-year-old entertainer was one of the many celebs at the event and she sat in the audience alongside her longtime friend Johnny Wujek.
Benj and Justin won a Tony Award and a Grammy Award for writing the music to the show. They only need an Emmy to complete their EGOT thanks to their Oscar from La La Land.
More members from the creative team who attended the opening included director Michael Greif, book writer Steven Levenson, and producer Stacey Mindich.
Dear Evan Hansen will play at the Ahmanson though November 25 before departing for other cities across the country.
Katy Perry Attends Opening Night of 'Dear Evan Hansen' in L.A.
Source: Just Jared