Billie Eilish’s Weight Loss Transformation Is Incredible! The Musician Then and Now [Photos]

2019

Billie rocked the stage at the Los Angeles stop of the iHeart Jingle Ball tour.

That year she explained the reason behind her love of baggy outfits. “Nobody can have an opinion because they haven’t seen what’s underneath,” the Grammy winner said as part of Calvin Klein’s ‘I Speak My Truth In #MyCalvins’ campaign.

“Nobody can be like, ‘she’s slim-thick,’ ‘she’s not slim-thick,’ ‘she’s got a flat ass,’ ‘she’s got a fat ass. ‘ No one can say any of that because they don’t know,” Billie added.

2020

Matching her bright green loose T-shirt and long shorts with her hair streak while on tour, Billie revealed about the early days of her career, “I wasn’t trying to have people not sexualize me. But I didn’t want people to have access to my body, even visually,” in a 2023 interview with Variety.

“I wasn’t strong enough and secure enough to show it. If I had shown it at that time, I would have been completely devastated if people had said anything,” she added.

2021

The musician served up Marilyn Monroe vibes at the Met Gala in a flowing peach tulle gown.

She said of her time as a platinum blonde, “I was really excited for the blond era — like, Blond Billie is gonna be so cool. But it did not go how I wanted it to go,” in a November 2023 interview with the Los Angeles Times.

“I completely had no idea who I was,” she recalled. “I came up with this whole aesthetic, and I just got swallowed up into it.”

2022

Billie’s baggy wardrobe still applied during a gym session selfie.

After posting a bikini photo in 2020, the “Happier Than Ever” singer told Dazed magazine, “I saw comments like, ‘How dare she talk about not wanting to be sexualized and wear this?’ It was trending. There were comments like, ‘I don’t like her anymore because as soon as she turns 18, she’s a whore.’ Like, dude. I can’t win … If there’s a day when I’m like, ‘You know what, I feel comfortable with my belly right now and I wanna show my belly,’ I should be allowed to do that.”

December 2023

Billie wore a fitting two-piece striped set that featured a floor-length skirt and oversized blazer with a plunging neckline. The ensemble inched into her waist, showcasing her tiny waist.

In a 2021 interview with Vanity Fair, the Los Angeles native sadly said about online discussions over her figure, “I thought that I would be the only one dealing with my hatred for my body, but I guess the internet also hates my body. So that’s great.”

2024

The Oscar winner wore a form-fitting black corset dress over a long-sleeved white blouse to the 29th Annual Critics Choice Awards, showing how her weight loss in 2023 and commitment to hitting the gym had continued into the new year.

March 2024

Billie sported a schoolgirl-inspired look at the 2024 Academy Awards, complete with a black and white plaid skirt, a black blazer, tall white socks and black Mary Jane shoes. She also supported an important cause by wearing a red “Artists for Ceasefire” pin on her lapel to call for an immediate ceasefire in Gaza.

February 2025

Billie continued to show off her weight loss while attending the Grammy Awards on February 2, 2025. She looked stylish in a black Prada ensemble that included baggy trousers and a white button-down shirt under a black collared shirt. Billie completed the look with loafers, a gray sailor cap and small black oval sunglasses.