Billie Eilish Pirate Baird O'Connell ( EYE-lish; born December 18, 2001) is an American singer-songwriter and musician. She first gained public attention in 2015 with her debut single "Ocean Eyes", written and produced by her brother Finneas O'Connell. In 2017, she released her debut EP, Don't Smile at Me, which was commercially successful, in various countries, including the US, UK, and Australia.

Eilish's debut studio album, When We All Fall Asleep, Where Do We Go? (2019), debuted atop the US Billboard 200 and UK Albums Chart and was one of the year's best-selling albums. Its single "Bad Guy" became the first by an artist born in the 21st century to top the US Billboard Hot 100 and be certified Diamond by the Recording Industry Association of America (RIAA).