'Roar' singer Katy was pictured striking a sexy pose and showing off her newly-dyed slime green hair while on a photoshoot.
Alongside the snap, the star joked: "Just a casual Tuesday lewk?"
Totally. We always wear a sparkling halterneck evening gown slit to the bum and no underwear on a Tuesday. Though we usually dress it up a bit more with some jewellery...
One of Katy's fans reckoned she looked a like a "hot mermaid", which we can see. Another simply wrote: "Pretty gorgeous."
Katy hit the headlines earlier this week when she swapped her jet black locks for a slime green colour. (Her words, not hers.)
The 'Dark Horse' singer kicks off her 'Prismatic World Tour', in support of latest album Prism, in Belfast, Northern Ireland on 7 May and will be on the road 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: