Jennifer Lopez has an entire room in her Long Island mansion devoted housing her wig collection.

The call it the “wig room.”

And in case you were wondering, the knobby-kneed hubby isn’t allowed to touch the hair.

“Jennifer keeps the door locked and hardly ever lets anyone in the room, not even Marc,” a source tells Star. “The shelves on the walls are full of plastic heads holding the best hairpieces money can buy.”

Jennifer, whose natural hair is described as “shoulder-length and very thin,” has thousands of dollars worth of specially hand-crafted human hair full-length wigs and hairpieces, tabloid tipsters have revealed.

“Jennifer spares no expense when it comes to her looks,” the insider explains. “….The wigs allow her to always be experimenting with new styles.”

“Hers are so elaborate, they seem to take on a life of their own!”