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.

A new song from Lady Gaga, an appearance from Kamala Harris, Olivia Rodrigo, Tate McRae, Stevie Nicks, a Nirvana all-star jam, and so much more. The city of L.A. got together at two arenas to raise money after the recent wildfires.

The members of No Doubt -- Gwen Stefani, Tom Dumont, Tony Kanal and Adrian Young -- reunited at FireAid Thursday night and sang some of their biggest hits, including "Just a Girl," "Spiderwebs" and "Don't Speak."