The hitmaker turned heads as she strutted along the red carpet at the Ocean's 8 UK film premiere held at Cineworld Leicester Square.
Wearing her dark tresses up in a top knot, the 30-year-old’s ample assets were impossible to miss thanks to her unusual frock.
Rihanna’s metallic dress struggled to contain her cleavage, which featured a plunging neckline and over-sized sleeves.
The singer seemed far from concerned by her risky number as it also showcased her toned pins perfectly.
The US star’s eye-popping offering also came complete with a dapper hem, shiny finish and was cinched in at the waist.
Rihanna added a matching pair of heels and a perspex clutch bag, before polishing off with hooped earrings.
She was seen attempting to readjust her outfit as she blew kisses to fans who had waited outside.
Earlier this week, the stunner took to Instagram to share a list of the current US box office top 10, with the film riding high in the number one spot.
Rihanna informed her 63.2 million followers: “Tried to tell y’all bout the God I serve!! Won’t he do it tho?(sic)
“Congratulations to all the ladies and the entire team that was a part of this project from beginning to end! This makes me so happy and proud to be a woman!”
She added: “Shout out to our amazing director, the great Gary Ross! #OCEANS @oceans8movie in theaters now!”
Rihanna plays Nine Ball in the spin-off from Steven Soderbergh's trilogy, which featured Brad Pitt, George Clooney and Matt Damon.
Directed by The Hunger Games’ Gary Ross, it follows a group of women lead by Danny Ocean's sister Debbie (Sandra Bullock) as they attempt to rob the Met Gala.
Debbie star Sandra, 53, risked a nip slip tonight as she wowed in a low-cut jumpsuit, with with sequins throughout.
The beauty drew to attention to her slender waist in the striped all-in-one before posing with Helena Bonham Carter, Sarah Paulson and Mindy Kaling.
The latter, 38, kept things glamorous in a floor-sweeping, black dress, with silver detailing on the middle and top half.
Sarah, 43, opted for a very unusual pink get-up, that hid her arms and leggings, and came with a high neckline
Helena, 52, kept things chic in a silver dress that clung to her curves and featured a demure, off-the-shoulder neckline.
Speaking to press, she said: “None of us knew it was going to come out after Me Too, that's serendipitous.
"It's fantastic, it's perfect, it's hit the G spot as far as just catching the zeitgeist. Just the reception it had, I was in New York and everyone just loved it and wanted to love it, they want to be taken on a ride."
Ocean's 8 opens in UK cinemas on Monday.