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.

Joan Jett, Kim Gordon and St. Vincent also joined Dave Grohl, Krist Novoselic and Pat Smear onstage at the charity fundraiser in Los Angeles

A trio of singers filled in for Kurt Cobain as Dave Grohl, Pat Smear and Krist Novoselic performed "Breed," "School" and "Territorial Pissings.”

Dave Grohl, Krist Novoselic and Pat Smear performed at the star-studded benefit, alongside Green Day, Billie Eilish, Lady Gaga, Red Hot Chili Peppers and loads of others

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

Music legend Stevie Nicks told a packed audience at Thursday’s FireAid benefit that Santa Rosa firefighters saved her Pacific Palisades home during the Los Angeles wildfires and dedicated a song to the group.

FireAid featured spectacular performances to raise funds for those affected by the devastating LA-area wildfires. Find out more about the concert and how to watch here.

An absolute highlight of FireAid was the comet-like reappearance of the remaining members of Nirvana onstage together playing the band's songs again.

Astros del pop, socorristas, rockeros y aquellos que lo han perdido todo en los devastadores incendios del área de Los Ángeles se unieron para FireAid, un enorme concierto benéfico el jueves que

Billie Eilish, Dr. Dre, Stevie Wonder, Green Day, Joni Mitchell, No Doubt and the remaining members of Nirvana all performed.