Dave Grohl's daughter Violet sang with his fellow Nirvana band members on Thursday, Jan. 30 at the FireAid Benefit Concert for California Fire Relief

Fans in the Intuit Dome wondering what hit them may have belatedly realized they were witnessing the closest thing to a Nirvana reunion we'll get: The band's three surviving members - Krist Novoselic,

Then came what was perhaps the biggest surprise: Violet Grohl, Dave’s 18-year-old daughter, singing lead vocals on Nirvana’s In Utero highlight “All Apologies.” Her vocals were strong and well-suited for the song, and while the magnitude of the Kia Forum’s crowd wasn’t lost on her, she was remarkably comfortable in front of the massive crowd.

FireAid had some surprises in store, but none bigger than the first reunion from Nirvana's surviving members in over a decade.

The surviving members of Nirvana reunited at FireAid, rocking through four of the grunge giant’s classic tracks. The unannounced performance marked Dave Grohl ’s return to the stage following public acknowledgement in September that he fathered a child out of wedlock.

St. Vincent, Joan Jett and Kim Gordon joined Pat Smear and original Nirvana members Dave Grohl and Krist Novoselic onstage for a reunion of sorts at FireAid Thursday. Violet, Jett, and Gordon each subbed in for the late Kurt Cobain.