Bille Joe Armstrong said it was an honor to "share the stage" with Billie Eilish at the FireAid benefit concert, which is expected to raise over $100 million in donations.

The band posted a series of pics with the "Birds of a Feather" singer after their team-up at last week's benefit that raised an estimated $100 million for wildfire relief.

Billie Joe Armstrong says it was an "honor" 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.