is making the whole world do a double take as she was snapped on the beach in Mexico in a thong bikini.
Un-retouched photos of the reality TV star show off her apple bottom and tiny waist.
Kim's on vacation with her sister Kourtney
and a few other girlfriends in celebration of Kourt's 38th birthday.
But no one can take their eyes off Kim, forcing rumors to start up again about if her butt is indeed real or fake!
They've been posting about their vacation on social media and appear to be having the time of their lives.
Stephanie Sheppard, Kim's assistant, also partook in the fun.