She wowed the crowds at the Met Gala in New York on Monday night in a jaw-dropping latex Thierry Mugler corset dress, and now Kim Kardashian has revealed the underwear that gave her that tiny waist.

Posting a video on Instagram Kim showed off the custom corset and thigh-length Spanx by French corsetiere, Mr. Pearl which helped her achieve her clinched-in waist.

https://www.instagram.com/p/BxM-LqlFGvO/

Kim told fans her gown was so tight she couldn't even sit down and had to stand in the back of a van and hold onto a pole to make her red carpet arrival.

She is said to have had to 'practice' breathing in her latex Thierry Mugler corset dress before heading to the Met Gala in New York on Monday night.The television personality, 38, had been following a strict diet and exercise regime so her figure looked jaw-dropping in the gold skin-tight beaded silicone dress.

However Kim revealed she could not be at the table 'for dinner' because her uber-tight silhouette would only allow her to 'half sit'.She also revealed she was transported to the prestigious event in a sprinter van with a pole installed for her to hold on too.

'I don't know why this is probably as nerve racking as my wedding, I don't know why I get so nervous for the Met, maybe even more so.

'I got three facials in a week and a half, I got a spray tan, I got a Korean spa scrub, literally every single day, any beauty treatment you can think of, I did it.'