LOS ANGELES (Reuters) - Billie Eilish made a surprise appearance on stage with Green Day on Thursday to kick off one of two star-studded concerts in Los Angeles put together to raise funds for people affected by deadly wildfires in California this month.

Pop stars, first responders, rock musicians, and wildfire survivors gathered for FireAid on Thursday night, a benefit concert to raise funds and share.

Green Day kicked off the massive FireAid benefit concert Thursday night, a two-venue concert extravaganza that is raising money for Los Angeles-area wildfire relief efforts.

Raising money for ongoing wildfire relief efforts in Los Angeles, Green Day and Billie Eilish dueted 'Last Night On Earth' at the FireAid benefit concert.

Billie Eilish, Lady Gaga, Stevie Nicks, Olivia Rodrigo and more performed for the FireAid Benefit Concerts for wildfire relief in Los Angeles on Thursday, Jan. 30. See the best photos from the shows here.

Billie Eilish delivers a heartfelt duet with Green Day for the Los Angeles FireAid concert. Read on to know the details.

Billie Eilish made a surprise appearance during Green Day's set at the FireAid benefit concert on Thursday night. The star-studded gigs were held simultaneously at the Intuit Dome and Kia Forum in Inglewood,

Billie Eilish has joined Green Day onstage at the FireAid Benefit Concert. Watch their performance of “Last Night on Earth.”

Green Day and Billie Eilish kicked off the massive FireAid benefit concert, a two-venue concert extravaganza that is raising money for Los Angeles-area wildfire relief efforts.

Billie Eilish hit the stage with Green Day, John Fogerty joined The Black Crowes and Crosby, Stills and Nash stars Stephen Stills and Graham Nash reunited for a rare performance together at the FireAid concerts in Los Angeles on Thursday night (30.

FireAid brought together artists from musical generations and genres to help raise money for Los Angeles-area wildfire relief efforts.