The singer, 39, posed in a white bra top with heavy black metallic leg armour to announce her new single Woman’s World.
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The track, her first in two years, is out on July 11, with a video release the next day.
In a snippet of the track shared online she sings: “Sexy, confident.
“So intelligent. She is heaven-sent.
“So soft, so strong.”
Katy, engaged to actor Orlando Bloom, is set to release her seventh studio album this year.
She said: “It’s very bright and joyful.”
Earlier this month Katy performed at a billionaire’s pre-wedding party.
Katy performed live at the pre-wedding celebration of Anant Ambani, 29.
Anant is the youngest son of Mukesh Ambani, the richest man in Asia with an estimated net worth of $116 billion at the time of writing, according to Forbes.