Billie Eilish made an appearance during Green Day’s set at the FireAid concert on Jan. 30. The Grammy winner came out as the rock band was performing “Last Night on Earth” and sang a stunning rendition of the song with them.

The all-star FireAid benefit in Los Angeles began with Green Day and Billie Eilish teaming up for the 'American Idiot' deep cut "Last Night on Earth."

Green Day kicked off FireAid Thursday night, launching into “Last Night on Earth," and quickly joined by Billie Eilish for the first surprise of the night. The lyrics are surprisingly astute: “If I lose everything in the fire / I’m sending all my love to you.

Green Day opened up the benefit concert and were quickly joined by Eilish for a performance of the band’s “Last Night on Earth” from their 2009 album “21st Century Breakdown.” Eilish departed the stage after the duet and Green Day continued with “Still Breathing” and “When I Come Around.”

Some of the biggest names in music will come together on Thursday to raise money for Los Angeles-area wildfire relief efforts.

A cavalcade of enormous rock and pop stars, old and new, will perform at an enormous benefit concert in Los Angeles, and streamed around the world.

FireAid, featuring Billie Eilish, Lady Gaga, Sting, Red Hot Chili Peppers and others in a fundraiser for Los Angeles-area wildfire relief efforts, is the latest event to combine music and philanthropy.

Featuring performances by Alanis Morissette, Joni Mitchell, Tate McRae and more, the concert can be streamed via most services.

FireAid, featuring Billie Eilish, Lady Gaga, Sting, Red Hot Chili Peppers and others in a fundraiser for Los Angeles-area wildfire relief efforts, is the latest event to combine music and philanthropy

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Billie Eilish, Gracie Abrams, Jelly Roll, Katy Perry and many others will perform at the event, which will be streamed on Apple TV+, Netflix, Prime Video and more