Step Aside Kim Kardashian! Ik Ogbonna shows off Fiancee Sonia's Mega Bum!

Uh ohhh! Mega is the only word I could find to describe Sonia's Bootai! 

Sonia sure dwarfs Kim Kardashian in the bum department..

Lets just say.. IK is so proud of what his girl's got that he could resist sharing..

The couple are expecting their first child together..