Happy 41st, Kanye!

Wifey Kim Kardashian is prepping what promises to be a HUGE, A-list birthday bash for Yeezy's 41st birthday, which was actually Friday. We snapped these shots of the couple's Calabasas mega-mansion as a crew constructed a huge white tent on the property -- which is STILL a construction site itself!

The never-ending work on Casa Kimye is probably one reason Kanye's been spending so much time as his retreat in Jackson Hole, Wyoming. Who could get any work done at home, with all the workers, noise and three kids?!

Stay tuned to X17online for coverage of Kanye's birthday party tonight!!!