She had to "practice" breathing in her corset before flaunting her incredible figure in a latex Thierry Mugler dress at the Met Gala on Monday night, according to Vogue.
And while trolls attacked Kim's incredibly slim and "fake" waist online, her personal trainer was quick to defend the reality star in a since-deleted Instagram story posted shortly after fashion's biggest night of the year.
The Daily Mail reports Melissa Alcanta posted a lengthy response to critics, writing that her client is "dedicated" and 'works her a** off' six days per week' to achieve her famous physique.
"To make things clear, 1. This dress is corseted BUT 2. Kim trains her a** off 6 days a f***ing week, she wakes up early af and is dedicated," she wrote online.