Billie Eilish's birthday is December 18, 2001.

Quick Facts

Born in Los Angeles, California, she turns 24 on December 18 each year, making her a Sagittarius. This date has been consistently confirmed across reliable sources like Famous Birthdays and Days of the Year.

Recent Celebrations

In 2025, Billie marked her 24th birthday by sharing a hilarious childhood crying photo on Instagram, which went viral and delighted fans worldwide. Fans buzzed about her unrecognizable throwback look and milestone vibe.

Fan Chatter

  • Reddit threads show adorable fan tributes, like a 4-year-old's Billie-themed birthday party with custom cookies and cutouts.
  • Discussions highlight her kid-friendly appeal despite edgier themes.

TL;DR: December 18—mark your calendar for next year's fan frenzy!

Information gathered from public forums or data available on the internet and portrayed here.