De acordo com Daily Mail, Eilish comemorou o aniversário na madrugada de sábado para domingo, no The Edition em West Hollywood, na Califórnia (EUA), ao lado do namorado Jesse Rutherford, da banda The Neighbourhood, do irmão e companheiro musical Finneas, e de amigos como Doja Cat, Avril Lavigne, Lil Nas X, Olivia Rodrigo, Dove Cameron, Kendall Jenner, Justin Bieber e a esposa Hailey, Gethin Davies (baterista do The Struts), Lauren Jauregui, Noah Cyrus, Eiza Gonzalez, Khalid entre outros.
E para a festa, a cantora se inspirou no clima Natalino e usou um figurino de Mamãe Noel, chegando até mesmo de trenó ao local. Veja os vídeos e as fotos abaixo:
Billie at her 21st birthday party tonight! ? pic.twitter.com/Y5BZRTLChc
— Billie Eilish Tours (@billieeilishtrs) December 18, 2022
? | @AvrilLavigne con Phem y Noah Cyrus en la fiesta de cumpleaños de @BillieEilish
— iAvrilSP Media (@iAvrilSPMed) December 18, 2022
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? | @AvrilLavigne with Phem and Noah Cyrus at @BillieEilish's birthday party pic.twitter.com/hOLAu0Lkxa
Billie celebrating her 21st birthday party tonight! ❤️? pic.twitter.com/pQctiYAN6N
— Billie Eilish Tours (@billieeilishtrs) December 18, 2022
Billie via @Domfishback's Instagram! ? pic.twitter.com/Ly0B54TTfA
— Billie Eilish Tours (@billieeilishtrs) December 19, 2022
More of Billie at her 21st birthday party last night! ? pic.twitter.com/9P8G1ghjKO
— Billie Eilish Tours (@billieeilishtrs) December 19, 2022
Billie with Zoe at her 21st birthday party last night! ? pic.twitter.com/nuXA7Qickx
— Billie Eilish Tours (@billieeilishtrs) December 18, 2022
Billie dancing at her 21st birthday party last night! ? pic.twitter.com/NCTfivA9sh
— Billie Eilish Tours (@billieeilishtrs) December 18, 2022
? |.@AvrilLavigne and Noah Cyrus at Billie Eilish's birthday party pic.twitter.com/lDXLXTO64z
— Avril Lavigne News (@AvrilNewsFans) December 18, 2022
Lil Nas X with Khalid at Billie Eilish's birthday party last night pic.twitter.com/mEil6V5ZOU
— ????? (@lilnasxmajor) December 18, 2022
Kendall, Hailey and Jesse at Billie Eilish's 21st birthday party ❤️? pic.twitter.com/oklukYxeXk
— kendall - style & outfits ? (@kenjenstyle) December 18, 2022
Lil Nas X with Avril Lavigne at Billie Eilish's birthday party last night pic.twitter.com/g6RqO8OcaA
— ????? (@lilnasxmajor) December 18, 2022
?|.@AvrilLavigne and Noah Cyrus at Billie Eilish's birthday party pic.twitter.com/gSF4EpiDjn
— Avril Lavigne News (@AvrilNewsFans) December 18, 2022
? | Olivia Rodrigo at Billie Eilish's 21st birthday party via @jamesgersh instagram stories. pic.twitter.com/3iNCGZXths
— Olivia Rodrigo Updates (@RodrigoUpdate) December 19, 2022
