Billie Eilish's natural hair colour is blonde.
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Billie Eilish: 22 facts about the No Time to Die singer you probably never knew
16. Billie Eilish's natural hair colour is blonde.
Billie Eilish is well known for colourful hair. Since rising to fame she's sported blue hair and more recently black hair with green roots. However, Billie's real hair is blonde. Billie showed fans her natural hair in a throwback photo on Instagram. [@billieeilish via Instagram]