Billie Joe Armstrong says it was an "honour" to perform with "pretty awesome young lady" Billie Eilish.
The 52-year-old rocker's band Green Day duetted with the 'Birds of a Feather' hitmaker on their 2009 track ‘Last Night On Earth’ at the FireAid benefit concert for victims of the Los Angeles wildfires at the Kia Forum on January 30.