She wore a tailored black jacket atop an untucked white button-up shirt, black slacks and matching dress shoes.

A collage of images dominated by the color blue, with the cover of Billie Eilish’s new album at the center. The singer and songwriter Billie Eilish, 23, has released three full-length albums.

Green Day kicked off FireAid ... Idiot deep cut “Last Night on Earth” and welcomed special guest Billie Eilish to perform onstage with them. “I’m here to honor you,” they sang ...

Billie Eilish and ... at the Kia Forum, Green Day kicked off the star-studded benefit show with an emotional performance of “Last Night on Earth” from the band’s 2009 album 21st Century ...

At the latter, the night is starting off strong with Billie Eilish joining Green Day for 21st Century Breakdown’s “Last Night On Earth.” Eilish walked onstage partway through the song.