Kim K. Wedding TWO Giant Moons Over Paris

4/30/2014 5:45 PM PDT

Kim Kardashian jetted off to Paris to get ready for her upcoming wedding to Kanye West ... and when she landed photogs got a giant surprise ... in the shape of Serena Williams' bubble butt. 

Serena and Kim hooked up for the Greatest (Ass) Show on Earth ... oh, and also because S-Dub’s probably a bridesmaid.