The 'I Will Never Let You Down' singer lit up the red carpet while arriving at the Royal Opera House in Covent Garden for the star-studded event, where she was joined by the likes of Kim Kardashian West, Nicole Scherzinger and Ellie Goulding.
Clearly wanting to keep all eyes on her for the evening, Rita sported a super-sparkly silver gown complete with a one-shoulder neckline and floor-trailing train.
Her lavish frock also featured a racy thigh-high slit to show off her enviable lengthy pins, which she topped with barely-there nude sandals.
Oozing glamour as she struck a pose for the photographers, Rita accessorised with heaps upon heaps of diamond jewels while decorating her talons with dazzling silver glitter.
And it's fair to say she turned heads in the hair department too!
The songstress styled her platinum blonde locks in a voluminous quiff while braiding one side back, leaving a shaved section of hair just above her ear exposed. Impressive!
Her make-up was pretty dramatic too, with the starlet shading her peepers with black, winged-out eyeshadow teamed with dark liner on her waterline for added intensity.
Rita also flaunted her trademark arched brows but ditched her signature red lippy, instead dabbing her pout with a pared-back nude shade.
We wonder if she was trying to show ex-beau Calvin Harris what he's missing?!
More stars at the GQ Men of the Year Awards:
Copyright: Daniel Deme
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Watch Rita's video for 'I Will Never Let You Down':