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.

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.

The concert will also be screened live at select AMC Theatres and and Regal Cinema locations in the U.S. If you will be on the move, iHeartRadio, the national audio partner for the event, will also feature the FireAid concert across over 860 radio stations in the U.S., digital platforms, and the iHeartRadio app.

The star-studded January 30 event is dedicated to rebuilding communities that have been devastated by wildfires

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.

FireAid is projected to collect $100 million in donations to those affected by the Los Angeles fires Billie Joe Armstrong was a Billie Eilish fan well before they shared the stage at FireAid. Following the benefit concert at the Kia Forum on Thursday,

Billie Joe Armstrong gushed that it was an "honour" performing with Billie Eilish at the FireAid benefit concert.