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The 19-year-old singer has switched up her trademark green and black 'do for a brand new look, posting the transformation on Instagram with the caption "pinch me".
We love it!
Alongside the change in colour, Billie has also had a cute fringe cut in. And fans are loving the look, with thousands taking to the comment section.
One wrote: "Aww LOVE It!"
While another said: "OH MY GOD YOU ARE SO GORGEOUS!"
"Living for this hair," added another.
At the end of last year, Billie responded to a social media user who questioned her on her hair colour.
"It's called not being depressed anymore pls just be happy for me," she wrote, adding: "This is the longest I've had the same hair color since I was 13 & that's on mental stability and growth, leave me alone."
Meanwhile, speaking about her upcoming album release - and how she managed to record it during the pandemic - she told Stephen Colbert on The Late Show: "I don't think I would've made the same album, or even the album at all, if it weren't for Covid. That doesn't mean it's about Covid at all, it's just that, when things are different in your life, you're different.
"That's just how it is. So, I have to thank Covid for that, and that's about it."
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