She suffered a potentially disastrous wardrobe malfunction while on the red carpet earlier on in the night.
And Rihanna still hadn't managed to tame her saucy ensemble, as she was seen struggling to not reveal too much while heading to London's Laylow restaurant for the Ocean's 8 afterparty on Wednesday night.
The 30-year-old singer was seen fiercely holding her one-shouldered metallic gold dress in place to avoid exhibiting too much of her ample assets.
Rihanna did her best to keep the garment in place as she strutted along to the eatery.
Going braless for the glamorous night out added to the star's struggle to not accidentally flash too much.
The number plunged excessively to one side, baring the inking on her decolletage as well as her sensational cleavage.
The Diamonds songstress managed to succeed in securing the daring number in place and finally looked at ease as she continued to party the night away.
Rihanna's glam look proved to be on point, as she teamed the eye-catching number with statement red lips and lashings of black mascara.
Pulling her raven tresses into a tight topknot, Rihanna looked in high spirits as she tottered along while harboring her belongings in a matching clutch.
Joining Rihanna for the afterparty were her stunning co-stars Sarah Paulson, Sandra Bullock, Mindy Kaling, and Cate Blanchett.
Sarah continued to show off her sartorial flair in her pretty pink-tiered dress.
Mindy couldn't wipe the smile from her face as she showed off her trim physique in her glamorous black gown.
Sandra Bullock made a rare appearance with her hunky man Bryan Randal.
The film star showed off her trim physique in a glittering jumpsuit as she walked arm-in-arm with the suited and booted hunk.
Meanwhile, Rihanna appeared to suffer the same far earlier on in the night when she posed on the red carpet at the London premiere of her new star-studded movie Ocean's 8.
As the Bajan beauty posed before hordes of photographers camped outside the English capital's Cineworld, Leicester Square, she was forced to hold up one side of her shimmering metallic gown as her bounteous bosom spilled out.
Maintaining an unwavering show-must-go-on smile as she sauntered her way along the expansive red carpet, the Rude Boy singer kept a hand firmly perched over her right breast while continuing to pose up a storm.
And while she attracted attention for what could have been a disastrous trip down the red carpet, Rihanna still proved to be the star of the show thanks to her show-stopping gown of choice.
Making her entrance later than the rest of her co-stars, the star wowed in her dress, which featured a low, plunging neckline, teasing her bust.
The crumpled, metallic look, fell off the songstress' curves as she strode into the West End venue, happily blowing kisses to the fans watching on.
She teamed the look with strappy matching heels and a clutch bag that perfectly complemented the color and texture of her dramatic dress.
Diamonds singer Rihanna displayed her shapely legs and toned arms as she walked into the multiplex, while her raven tresses were styled in a sleek topknot.
She added a pop of bright red lipstick to her pout, which matched her manicure, and swept dark mascara across her lengthy lashes.
Rihanna teamed the gold dress with matching ringed earrings, which rounded out her ensemble and solidified her status as the night's golden girl.
At the event, she joined her A-list co-stars Sandra Bullock, Helena Bonham Carter, Cate Blanchett, Sarah Paulson, and Mindy Kalling. The film also stars Anne Hathaway and rapper and actress Awkwafina, both of whom were not present.
Ocean's 8's all-star female line-up sees Debbie (Sandra) - the estranged sister of Danny Ocean - attempt to pull off a $150 million heist at the Met Gala.
Sarah Paulson plays Tammy, a suburban mother and Debbie's former partner-in-crime, while Mindy is along for the ride as Amita, a jewelry maker. Meanwhile, Rihanna portrays Nine Ball, as a tech genius.
Helena appears as Rose Weil, a fashion designer, in the summer blockbuster. On the other side Anne Hathaway plays Daphne Kluger, a celebrity and the target of the heist, whose assistant is James Corden (as John Frazier).
It will also see cameos from Anna Wintour, Zayn Malik, Katie Homes, Serena Williams, Kim Kardashian, Kendall Jenner, and Kylie Jenner.