Find Out Who Attended Billie Eilish's 21st Birthday Party!

It’s Billie Eilish‘s big day!

The “You Should See Me in a Crown” singer turned 21 on Sunday (December 18), and she just celebrated in style along with her boyfriend Jesse Rutherford, as well as a bunch of celebrity friends and family.

Billie was joined by family, including brother Finneas, and her boyfriend onstage at her show at the Kia Forum on Friday night (December 16) in Inglewood, Calif., where they surprised her with a cake at her final “Hometown Encore” show.

She blew out her candles in front of the crowd, before giving her parents a hug, via People.

“Want to take shots? Give me two days,” Billie joked. “I am 21 in two days, it’s f—- unbelievable.”

She was then pictured celebrating while sitting on a sleigh with a friend at The Edition on Saturday night (December 17) in West Hollywood, Calif.

Several celebrity friends also confirmed their attendance at Billie‘s holiday-themed birthday party on their social media, sharing photobooth photos from the big night and clips dancing and eating holiday treats.

In one video shared by Avril Lavigne, Billie was seen kissing her boyfriend Jesse at the big night.

Find out who attended Billie Eilish’s 21st birthday party…