The "Beauty and the Beast" actress cut a stylish figure at the screening of her new thriller "The Circle", along with co-star Tom Hanks.
The strappy dress was so low that the actress accidentally flashed a peek at her nipple covers that had been strategically placed to hide her modesty.
While the patterned gown billowed out at her trim hips, the top half was daringly plunging on Watson's decolletage (top), reports mirror.co.uk.
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The stunning white and blue dress also featured a cutaway mid-section that revealed a hint of Watson's tiny waist.
Apart from the dress, the 27-year-old actress kept her makeup simple with just a sweep of bronzer and subtle smokey eyes with natural nude lips.
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"The Circle" is based on Dave Eggers 2013 novel of the same name.