'Shahs of Sunset' Chick I'VE GOT ASS LIKE KIM K

10/26/2013 12:20 AM PDT

Kim Kardashian started an ass-selfie trend ... 'cause after she shared her bikini-wedgie with the world ... ANOTHER wanna-butt celeb is following suit.

This time, the chick showing off her donk is Mercedes "MJ" Javid from "Shahs of Sunset."  

It's definitely a change of pace from Kim ... and pro surfer Anastasia Ashley, who beat MJ to the punch with a butt-selfie last week.

Butt-selfies -- sometimes they're not all they're cracked up to be.