ALEXJR / BACKGRID Billie Eilish is having a rootin’, tootin’ good Halloween! The 21-year-old singer nailed the spooky season with a fun cowgirl costume for this year's celebrations and was ...

he inquired. “I love this question! I absolutely hated my name when I was a kid,” Eilish admitted before explaining that people told her Billie “was a boy’s name” all her life.