Promoting the new crime thriller Widows in London last night, the A-List star sizzled in a structured white gown by Swiss designer Akris.
Featuring a plunging neckline and billowing sleeves, the 40-year-old actress opted to go bra-less for the occasion and gave a mega fashion nod to the daring side boob trend.
Letting her sexy dress do all the talking, the Texas born starlet paired her gown with sophisticated silver jewellery and minimal make-up.
Turning heads on the red carpet, Michelle flashed some serious side boob as she greeted her adoring fans in the wings.
Showing off her enviable figure as she signed autographs and posed for selfies, the action star's billowing sleeves took the side boob trend to daring new extremes.
Happily showcasing a sexy bit of side boob, the designer gown showed off the American actress' super toned trim figure.
Promoting her new film Widows in London, the upcoming action thriller by acclaimed director Steve McQueen follows four armed robbers after a failed heist attempt and also stars Oscar-winning actress Viola Davis.
The film is due to hit UK screens on 6 November.
Meanwhile, across town Love Island's Zara McDermott also gave a nod to this summer's most daring fashion trend.
With the Love Island 2018 gang out in full force to support Dani Dyer and her new collection for In The Style, Zara modelled a super sexy crop top which featured plenty of under-boob.
Pairing the minuscule black strappy bandeau with a high-waisted black bodycon skirt, the reality star kept her outfit completely monochrome with a black leather handbag and minimal jewellery.
No stranger to the underboob trend, the 21-year-old star rocked plenty of daring swimsuits during her Love Island stint earlier this summer.
In even more fashion news, underboob is the latest bikini trend for celebrities including Olivia Atwood and Iggy Azalea… and there's a reason why they love it.
Plus side boob inking is the latest beautiful tattoo trend… but it does look painful.
And Holly Willoughby's latest Celebrity Juice outfit mocked by cruel trolls who claim she should "fire her stylist".
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