Jessica Simpson -- Part Indian, Part Mysterious

When Jessica Simpson looked into our camera this weekend and claimed, "I am Indian" -- she wasn't kidding around.

Jessica's rep tells TMZ the singer is 1/16th Native American "on her mother's side."

So far, Simpson's peeps have not revealed which tribe Jessica is descended from.

Of course, the revelation only came to light after Jessica started receiving criticism from Native American groups after she claimed she wasn't an "Indian giver" -- regarding a gift she bought Tony Romo.