In honor of the singer-songwriter's birthday today, L'OFFICIEL takes a look back at her ever-changing beauty looks.

Known for her undeniably edgy style and distinct timbre, <a href="https://www.lofficielusa.com/fashion/billie-eilish-and-finneas-best-matching-looks" target="_blank" rel="noopener">Billie Eilish is an all-around icon.</a>
The seven-time Grammy award-winning singer-songwriter who turns only 21 years old today is admirably <a href="https://www.lofficielusa.com/music/billie-eilish-billboard-woman-of-the-year-2019" target="_blank" rel="noopener">unafraid to be herself,</a> illustrating this self-awareness through her boundary-breaking garment choices and vibrantly colored hair.
Though Eilish typically maintains a grunge-inspired aesthetic, she does not hesitate to step into new areas of fashion, <a href="https://www.lofficielusa.com/music/billie-eilish-music-style-evolution-happier-than-ever-album" target="_blank" rel="noopener">allowing her to evolve</a> in great style.
From her Old Hollywood glamor look at the 2021 Met Gala to her OG neon green roots, L&rsquo;OFFICIEL rounds up some of the performer's most iconic beauty moments in honor of her birthday.

Taking to Instagram once again to debut a return to her dark-brown locks, Eilish proves that power of a <a href="https://www.lofficielph.com/fashion/celebrity-hair-transformations-2021-haircut-color-changes" target="_blank" rel="noopener">hair transformation</a>, and that style and beauty can evolve seamlessly in the span of one year.&nbsp;

Promoting her <a href="https://www.lofficielusa.com/beauty/billie-eilish-launches-first-fragrance-perfume" target="_blank" rel="noopener">new fragrance</a> on Instagram, Eilish donned undeniably radiant skin, her staple glossy lip, and a soft gold shadow below the lower lash line.&nbsp;

At the <a href="https://www.lofficielusa.com/fashion/kate-middleton-channels-princess-diana-dress-no-time-to-die-premiere" target="_blank" rel="noopener">London premiere of No Time To Die,</a> the James Bond film in which Eilish sings the theme song, the Grammy winner styled her bleach blonde bob in a choppy fashion and rocked gold leaf just beneath her brow for an added glimmer.&nbsp;

An ode to Marilyn Monroe, Eilish attended the <a href="https://www.lofficielusa.com/fashion/met-gala-2021-naked-dress-backless-sheer-trend" target="_blank" rel="noopener">2021 Met Gala</a> in full <a href="https://www.lofficielusa.com/travel-living/old-hollywood-sailing-photos-summer-inspiration" target="_blank" rel="noopener">Old Hollywood glam</a>. Pairing an Oscar de la Renta gown with her sweeping blonde bob, bold black eyeliner, and a matte red lip, the singer-songwriter left her fans in awe.&nbsp;

Taking to Instagram to debut a <a href="https://www.lofficielusa.com/fashion/billie-eilish-instagram-viral-blonde-shag-haircut" target="_blank" rel="noopener">rugged bleach blonde</a> chop earlier this year, Eilish never fails to surprise her devoted fans. Pairing a glossy lid with a soft pink pout, the singer-songwriter proves she can rock even the simplest of looks.&nbsp;

For the promotion of <a href="https://www.lofficielusa.com/music/billie-eilish-new-album-happier-than-ever-instagram" target="_blank" rel="noopener">her most recent album "Happier Than Ever"</a> via Instagram, Eilish posted a host of photos in which she rocks glossy locks, a glossy peach lip, and highlighter visible from the moon.&nbsp;

Masked up in pink and black, Eilish wore a pink and black floral suit with a matching manicure on the carpet of the 2021 Grammy Awards.

Coordinating her iconic green and black hair with her custom Gucci look, <a href="https://www.lofficielusa.com/music/billie-eilish-is-not-your-pretty-little-pop-star" target="_blank" rel="noopener">Eilish was the star</a> of the show at the 2020 Grammy Awards. Taking home five awards over the course of the evening, Eilish not only won in the music department, but in the beauty department as well.&nbsp;

Seafoam Green Locks For The Win&nbsp;

For her attendance at the 2019 Sean Penn CORE Gala, Eilish paired soft blue-gray locks with her classic glossy lip and clean skin look. Known for her inclination to rock radical looks, <a href="https://www.lofficielusa.com/music/billie-eilish-documentary-trailer-the-worlds-a-little-blurry-apple-tv" target="_blank" rel="noopener">Eilish</a> can make even the boldest of hair colors appear effortless.&nbsp;

Billie Eilish's Best Beauty Moments

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