Long-time fans know that Billie Eilish has had a major style transformation ... change in 2021 for her second studio album "Happier Than Ever," wearing a Hollywood-glam ball gown to the Met ...

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

Billie Eilish ... Since then, Eilish has claimed four more wins, and she’s also taken the Grammys stage on multiple occasions ...

Wearing a Loewe shirt and Orseund Iris skirt, Billie Eilish attends the "Happier Than Ever: A Love Letter To Los Angeles" Worldwide Premiere at The Grove on August 30, 2021 in Los Angeles ...

Billie Eilish’s brother and frequent collaborator Finneas addressed fans after the duo lost out on their nominations at the 2025 Grammys.