Nasty Feud on the Prairie

From TMZ, Nasty and spoiled rotten Nellie Olson is declaring war on poor blind Mary Ingalls. Say it ain't so!

According to Alison Arngrim, aka Nellie, she only played the bitch, while Melissa Sue Anderson -- Mary -- was the real thing.

In next week's issue of Steppin' Out, Alison goes off, calling Melissa "seriously high maintenance" and saying she was the most difficult person on the show. And she didn't stop at there. She called her mom the "worst stage mother," and compared her to Dina Lohan. Oh, it is so on!

Arngrim did admit "playing a blind girl is a drag, but [Melissa] was a bitch before she went blind." Meow!