Katy Perry has something to say about Carrie Underwood replacing her as a judge on American Idol.

Take a look at some of the most special moments from FireAid below. Remaining Nirvana members reunited with special guests.

Katy Perry, Billie Eilish, and Nirvana, music icons who rule the music industry with their vocals talent, recently teamed up ...

Katy Perry, Billie Eilish, and Nirvana, music icons who rule the music industry with their vocals talent, recently teamed up ...

The two-venue FireAid Benefit Concert was held in Los Angeles on Thursday night to help raise money for the Southern ...

The FireAid Benefit Concert has drawn millions of viewers worldwide as a slew of star-studded performers help raise money for those affected by the Los Angeles wildfires in January.

Follow live updates on the FireAid benefit concert, which will feature performances from Billie Eilish, Lady Gaga and more, as they raise money for Los Angeles-area wildfire victims.

Backed by a somber choir providing harrowing backup vocals, Perry belted out her resilience anthem “Rise,” a hit song ...

Recap of FireAid LA from Billie Eilish, Gracie Abrams and Tate McRae to Katy Perry and all of the surprise guests.

Follow live updates on the FireAid benefit concert, which will feature performances from Billie Eilish, Lady Gaga and more, as they raise money for Los Angeles-area wildfire victims.

Katy Perry belted out “California Gurls,” and Joni Mitchell offered a rare performance as Angelenos spoke movingly about loss ...

As Southern California begins to rebuild in the wake of the wildfires, Live Nation is assembling some of Hollywood's biggest ...