Rebecca Hall jumped on two trends at the Iron Man 3 London premiere, opting for an androgynous-style black jumpsuit with an eyeful of is-it-intentional-is-it-an-accident trend, side boob.
The wardrobe malfunction gave us a glaring view through the side of Rebecca's low-cut, sleeveless jumpsuit by Lavin, from the Spring 2013 collection. She later on attempted to conceal her biggest ever fashion faux pas by keeping her arms firmly to the front.
The rest of her makeup was fresh faced with just a touch of mascara and well-groomed eyebrows.
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The British actress also went for simplicity when it came to accessories, wearing sparkling De Beers diamond studs in her ears and carrying a tiny, black Lanvin clutch. She finished off the ensemble with black sandals by Giuseppe Zanotti.
The 30-year-old represented the Iron Men ladies at the London premiere, in the absence of co-star Gwenyth Paltrow, who's been seen at evens throughout film's promo tour.
She's just one of the red carpet stars who have opted for masculine tailoring this season and we expect the trend to continue, with many Fashion Week AW13 shows displaying a similar style for upcoming seasons.
Jumpsuits are also having a moment (for the brave and fair of figure), with stars including Jessie J and Jennifer Lawrence giving them the celeb seal of approval.