'California Gurls' singer Katy, 29, showed off her eye-catching new look – and cut? - via Instagram on Monday night (7 April) alongside the caption: "Slime green for spring."
Now, we're not sure we'd really want a hair colour that had the word 'slime' in its descrption but each to their own. And you can't deny Katy pretty much always looks fab…
Green is just the latest colour that Katy's experimented with when it comes to her locks. She's already been black, brown, blonde, red, blue and even pink.
She's certainly adventurous!
Most recently, the starlet's been rocking jet black hair instead of her natural blonde, explaining in an interview last year that she felt her golden hue "just didn't look right" on her.
It's going to be a big year for Katy, who kicks off her 'Prismatic World Tour', which kicks off in Belfast, Northern Ireland on 7 May and runs through to December, where it is currently scheduled to wrap in Australia.
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Watch Katy's music video for 'Dark Horse' below: