Popsugar Fashion Celebrity Style Billie Eilish Wears a Santa Costume For Her 21st Birthday Billie Eilish Celebrates Her 21st Birthday in a Santa Micro Minidress 19 December 2022 by Sarah Wasilak View On One Page Photo 1 of 3 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 Previous Next Start Slideshow Celebrity StyleBillie EilishShoppableCelebrity InstagramsGet The LookHoliday FashionCelebrity Birthdays