Kim Kardashian Wedding -- TWO Giant Moons Over Paris

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.