"From the bottom of our hearts, we love you Los Angeles," Billie Joe Armstrong told the crowd, "and we've got your back no matter what"

Thursday night's FireAid concert opened up with performances by Green Day, Billie Eilish, Alanis Morisette, Anderson .Paak and Dr. Dre. Comedian and actor Billy Crystal also shared a moving story about the loss of the home he's lived in with his family for 46 years,

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.