Kendall Jenner flashes her abs as she and pal Hailey Bieber arrive at Milan Fashion Week - Daily Mail

'Delete this immediately,' Kylie, 23, instructed Kim, 39, in the comments section of the photo, which was taken circa 2009 and posted Friday. .

Fans flooded the comments section, remarking on just how different everyone looked in the flashback photo than they appear nowadays. 

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