The stunning singer took to the pink carpet channelling ballet chic in a pale-coloured frock with elaborate gold detailing.
The figure-hugging design was heavily embroidered with gold floral patterns and featured a white chiffon skirt and neckline reminiscent of a dancer's tutu.
To honour Britain at the premiere of Katy Perry: Part of Me 3D, the style savvy star accessorised the pretty design with a Union Jack cocktail ring and blue, red and white false eyelashes.
Katy teamed the ensemble with a stunning pair of nude diamond strap sandals.
Wearing her purple and black her in a chic up do with a sparkling headband, she looked every inch the Hollywood princess. However, the 27-year-old kept her make-up in the gothic style she has recently been working.
Her dark smoky eyes and burgundy lipstick set off Katy's porcelain skin to perfection.
Former Pussycat Doll Kimberly Wyatt rocked the current pyjama trend in a turquoise print ensemble. She teamed the standout look with nude peep toe heels and a bright blue mani-pedi.
Katy's pal and celebrity blogger Perez Hilton unleashed his inner beach boy for the occasion, stepping out in raspberry coloured shorts and a cheeky t-shirt vest. He finished off his bright look with a pair of green and orange trainers.
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