Billie Eilish set the tone of 2025 iHeartRadio Music Awards with a stunning performance of "WILDFLOWER."

Joined by her brother and collaborator FINNEAS, Eilish kicked off the show at the Dolby Theatre in Los Angeles on Monday (March 17) with an ethereal performance of the track from her third studio album, 2024's Hit Me Hard and Soft.

Boosted by the audience holding up lights throughout the theater, FINNEAS accompanied his sister on an acoustic guitar as Eilish captivated the crowd with her mesmerizing vocals. The duo built steam throughout the song, with the chorus swelling as the audience cheered along.

The crowd was so caught up in the moment that as Eilish reached the outro, a hush fell throughout the arena as her echoed voice as she crooned, "I know you didn't mean to hurt me, so I kept it to myself."

In addition to her performance, Eilish was up for several awards at the 2025 iHeartRadio Music Awards, including Pop Artist of the Year, Artist of the Year, Best Lyrics ("BIRDS OF A FEATHER") and Favorite Tour Style (Hit Me Hard and Soft).

Hosted by LL COOL J, the 2025 iHeartRadio Music Awards featured a handful of incredible performances by many of your favorite artists, such as Billie Eilish, Bad Bunny, GloRilla, Kenny Chesney, Nelly, Gracie Abrams, Muni Long and more as well as special appearances from Becky G, Billy Idol, Kelsea Ballerini, Victoria Monét, Jenny McCarthy-Wahlberg, Robin Thicke and more. Don't miss out on the best red carpet fashions and the tally of who took home the biggest awards of the night.