▲Her parents, Maggie Baird and Patrick O'Connell, wanted her first name to be "Eilish," but Baird's father Bill died during her pregnancy so they named their daughter after him. Pirate comes from Finneas' insistence, when he was four years old.

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At just 17 years old, Eilish received six Grammy nominations, becoming the youngest nominee ever to earn nominations in all of the four major categories.

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Eilish and O'Connell told Apple Music's Beats 1 that the young star was a very shy kid, who would sing into a pillow and got nervous when people asked her to perform something.

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Eilish used to work at a stable in exchange for horse riding lessons, and though she stopped because she "couldn't take being the poor girl around the stable," she has continued to ride as a means of improving her mental health, and now she can afford to!

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She collaborated with H&M to release a sustainable fashion collection featuring beanies, hoodies, buckets hats, and more. Of course, offered in neon green.

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She became the youngest woman to reach the top spot on the UK albums chart, and also set the record for most simultaneous US Hot 100 entries by a woman.

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'Don't Smile at Me' reached the top 15 in the US, UK, Canada, and Australia, garnering millions of streams on Spotify long before her studio album came out.

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Eilish has said that her all-time favorite film is 2013's 'Fruitvale Station,' about the real-life shooting of black teenager Oscar Grant by a transit police officer in Oakland, California in 2009.

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The album contains six Billboard Hot 100 top 40 singles: 'When the Party's Over,' 'Bury a Friend,' 'Wish You Were Gay,' 'Xanny,' 'Everything I Wanted,' and 'Bad Guy' all charted in the Billboard Hot 100 top 40 singles. 'Bad Guy' also became her first no. 1 single in the US.

▲Eilish practiced ballet, tap, jazz, hip-hop, and contemporary dance for several years, but she said she experienced body dysmorphia and hated to see herself in those tiny clothes.

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Growing up in LA, Eilish provided background vocals for films like 'Diary of a Wimpy Kid' and 'X-Men.' She was also home-schooled and graduated via a high school equivalency exam at 15.

▲In 2019, Fashion search engine Lyst's Year in Fashion report looked at data across six million fashion products to determine the 10 stars whose style drove spikes in searches, sales, news coverage, and social media mentions over the year.

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She also increased searches for the brand BBCICECREAM by an impressive 211% after she tagged them in an Instagram post.

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She's such a huge fan, in fact, that she sampled dialogue from a season seven episode in her song 'My Strange Addiction.'

▲To announce the Justin Bieber remix of 'Bad Guy' in 2019, Eilish posted a throwback of herself in front of a wall of Justin Bieber posters, of whom she was a big fan when she was 12. "Anything is possible man," she wrote.

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Eilish drove up searches for the color neon green by 69%, this after wearing several neon green outfits and dyeing her hair.

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When accepting the award for Variety's Hitmaker of the Year, Eilish explained that someone told her there was no hit on the album, which she followed up with, "that fool was wrong!"

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Her first studio album debuted atop the Billboard 200 and became the top-performing album of 2019 in the US, also reaching number one in the UK.

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In November 2018, after compilation videos of her tics began to surface online, Eilish confirmed that she has Tourette syndrome, involving only physical tics.

▲Eilish describes her brother, who's four years older, as her best friend and producer. "He's the only reason I'm anywhere in the whole world and he's probably the only reason I'm alive," she said.

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Eilish often advocates for veganism, once saying to her Instagram followers, "I understand that meat tastes good … and I know you think you're just one person and it won't change anything if you stop but that's ignorant and stupid … Be smarter."

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The reason her music videos are so impactful is because Eilish has synesthesia, a neurosensory condition in which one sense is perceived along with other senses.

▲During one hip-hop class, she ruptured the growth plate in her hip and had to quit dancing. "It sent me down a hole. I went through a whole self-harming phase," she told Rolling Stone.

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After having recorded a song with her brother at home for fun, she was suddenly signed with Darkroom and Interscope Records, but insisted she had to continue working with her brother.

▲While many have theories about why Eilish wears baggy clothes, she told Elle they're all missing the point. She was, however, shocked when her breasts were written about by several news sources after she dared to greet fans in a tank top. She was still just 17!

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Finneas also spoke about the articles claiming he's not "just" Billie Eilish's brother, and clarified, "Just being Billie Eilish's brother is all I ever wanna be. I love Billie more than anything else and I'm so grateful to you and I love you."

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Though Lizzo led with eight nominations, Eilish and Finneas collectively shared 11 nominations, as her brother was her main instrumentalist and produced the whole album.

▲She explained, "so everything that I make I'm already thinking of what color it is, and what texture it is, and what day of the week it is, and what number it is, and what shape," adding that her brother Finneas has it too.

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He said of her trust in him: "It was incredibly ambitious, and you thought every idea I had was the best idea, and I couldn't be more proud of every song that I've made with you."

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The artists made history by completing the "Grammys Grand Slam" together (receiving nods in all four big categories: Record, Album, and Song of the Year, as well as Best New Artist). Two artists have never achieved the feat in the same year. What's more, Eilish went on to win all four awards, making her the youngest Grammy winner ever in all four main categories.

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Her documentary, 'The World's a Little Blurry,' follows Eilish as she navigates life at 17, juggling a hectic touring schedule with typical teenage concerns, and all while creating her debut album. In this post-'Framing Britney Spears' world, many are using the doc to compare how the industry both has and hasn't progressed in its treatment of young female stars. The difference, according to director R.J. Cutler, is that Eilish “has a tremendous support system and infrastructure," E! News reports. Eilish has the transparency that Britney Spears needed.

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Eilish first gained attention in 2015, when she uploaded the song 'Ocean Eyes' on SoundCloud. It was written and produced by her brother, Finneas O'Connell. She was not even 14 yet.

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Eilish entered the 2021 Grammys with four nominations, and took home Record of the Year (for her song 'Everything I Wanted') for the second consecutive year. She also won Best Song Written for Visual Media for the track ‘No Time To Die.’

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When she was just 17 years old, singer-songwriter Billie Eilish was nominated for six Grammys, named Billboard's Woman of the Year and Variety’s Hitmaker of the Year, accumulated over 45 million followers on Instagram, became a fashion icon, and released her first studio album while also setting two Guinness World Records. Now, she's completely changed her look multiple times, has over 119 million followers, she's released a documentary, has dropped her third studio album to critical acclaim and presented the turnover of the Olympics from Paris to LA.

Eilish is the first chart-topping artist born in this millennium, and she's never owned a CD. Check out this gallery to learn more about the endlessly fascinating star who has zero interest in playing by the rules.

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The singer shared a series of stages in Long Beach with veterans like the Red Hot Chili Peppers, Snoop Dogg, and Dr. Dre, capping off the closing ceremony of the Paris 2024 Olympic Games and turning them over to LA for 2028.