- On February 9, 2020, she performed at the Academy Awards during the In Memoriam sequence with a song "Yesterday" along with her elder brother Finneas O'Connell.
- She won five Grammy Awards in 2020 becoming the second person (after Christopher Cross in 1981), first woman and the youngest person ever to win the four main Grammy categories, Best New Artist, Record of the Year, Song of the Year, and Album of the Year in the same year.
- Became the youngest artist in history to write and perform a James Bond theme, which she did for No Time to Die (2021).
- She began singing at a young age and began writing songs at age 11, taking after her elder brother Finneas O'Connell, who was already writing, performing, and producing his own songs with his band.
- Billie was named after her maternal grandfather, Bill Baird who died before she was born. Her middle name, Eilish is the Irish form of Elizabeth. Pirate came from Finneas because he really wanted her to be named that, Baird is her mother's maiden name and O'Connell is her paternal family surname. Originally, she was going to be named Eilish Pirate O'Connell.
- She is the first artist born in the 21st century to top the Billboard 200.
- Said that she prefers to wear baggy clothing in order to avoid being sexualized.
- Her mother Maggie Baird taught improv to Melissa McCarthy who is now Eilish's huge fan.
- Has synesthesia, which causes her to see music as colors. She uses this condition to her advantage, as it has a great influence on the style of her music videos. Has been diagnosed with attention deficit hyperactivity disorder (ADHD) and Tourette's syndrome since childhood.
- She has cited Spice Girls, Britney Spears, Nicki Minaj, Amy Winehouse, Avril Lavigne, Marina Lambrini Diamandis, Adele, Taylor Swift, and Lorde as her huge influences.
- She has been compared in the media to both Lorde and Lana Del Rey, the latter of whom she says she does not want to be compared to, saying in a Los Angeles Times interview, "That woman [Lana] has made her brand so perfect for her whole career and she shouldn't have to hear that.".
- On March 3, 2020, she encouraged fans online to register to vote for the 2020 U.S. presidential election. On August 19, 2020, she performed at the 2020 Democratic National Convention and announced her endorsement of Joe Biden's presidential campaign.
- She collects Barbie dolls. It was a family tradition for her to get a Holiday Barbie every Christmas for her parents. She dressed up as her favorite Holiday Barbie for the 2021 Met Gala sponsored by Instagram.
- She has named Rihanna as an inspiration for her style choices, after she called fashion her "defense mechanism" during an acceptance speech.
- She has cited Tyler the Creator and Donald Glover as major musical and style influences for her, and other influences include Earl Sweatshirt and Lana Del Rey.
- Raised in Los Angeles' Highland Park neighborhood.
- Joined the Los Angeles Children's Chorus at age 8.
- Younger sister of Finneas O'Connell.
- Hip hop music is her favorite genre and biggest inspiration.
- Since 2017, she does the "same interview" every year on October 18th, two months before her birthday, with Vanity Fair magazine.
- Since October 2022, Eilish had been in a relationship with fellow singer Jesse James Rutherford. The couple had faced some backlash since making their relationship public because of their 10-year age gap. In May 2023, the couple separated and remained good friends.
- She has Irish and Scottish ancestry.
- She was one of several attendees of the Academy Awards to wear the Artists4Ceasefire badge supporting peace against the genocide underway in Palestine. (2024)
- She has said that she is attracted to both men and women.
- Most of her song titles are written in lower case.
- On March 10, 2024, at age 22, she became the youngest two-time Academy Award winner, following her second 'Best Original Song' Oscar win for "What Was I Made For?" from Barbie (2023). Her first win was for "No Time to Die" from the James Bond film of the same name. She is also the first person born in the 21st century to win an Academy Award.
- She was raised vegetarian and became vegan who advocates for animal rights and veganism on social media. She also has a dog.
- She saw the original Broadway run of "Matilda" six times, and says that it's her favorite musical ever.
- On March 12, 2023, she and actress Megan Fox attended the 2023 Vanity Fair Oscar Party hosted by Radhika Jones at the Wallis Annenberg Center of the Performing Arts in Beverly Hills, California. Fox wore a plunging black velvet dress and a dazzling diamond necklace as she posed alongside Eilish.
- She worked with others to begin and fund REVERB's Music Decarbonization Project, and as part of a decarbonization project used solar powered stage lights. (2023)
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