How Billie Eilish has transformed her style with colorful hair, from green roots to a blonde bob she regrets

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• Billie Eilish has made some drastic hair changes since releasing her first song in 2016.
• She's experimented with neon-green roots, vibrant blue strands, and even gray hair for a period.
• The 22-year-old has also tried wearing a blonde bob and longer brown styles.

Billie Eilish has been rocking bold hair since the start of her career.Billie Eilish attends Nylon's Young Hollywood party on May 22, 2018.