Audiences tuning into the FireAid benefit concert for Los Angeles on Thursday night (Jan. 30) were surprised with an early treat when pop superstar Billie Eilish made a surprise appearance alongside Billie Joe Armstrong and the rest of Green Day for a stirring opening performance.

Dozens of stars will take to the stage in the two-venue extravaganza, which aims to raise money for those affected by this month's fires.

FireAid—a benefit concert for victims of the L.A. wildfires featuring Lady Gaga, Olivia Rodrigo, Billie Eilish, Jelly Roll and several others is this week. Find out when you can watch it and where.