Somebody drew a mustache on the face of MIRANDA LAMBERT that's on a billboard welcoming people to Lindale, Texas, which is where she grew up. And they used a permanent marker, which made it impossible for workers to erase it.

The city is removing the whole billboard and printing up a new one. An investigation is underway and the perps could be looking at either a class-A or class-B misdemeanor, depending on the cost of replacing the sign. See the sign right HERE.