EXCLUSIVE

Lisa Vanderpump just built a fabulous new home where her miniature horses can roam in the middle of Beverly Hills. Sorry, deer and antelope ... you're on your own.

LV's pal Mohamed Hadid designed, built and painted a mini barn for the mini horses Lisa just bought for hubby Ken's birthday. We're told Mohamed hammered out the project over 2 weeks ... so the lil' Vanderponies could ball out in true Bev Hills fashion.

He painted it pink because it's Lisa's favorite color -- which is weird, since the horses are Ken's gifts ... but whatever.