The O.J. Simpson rumor isn't exactly a new one, but it's a low blow!

On Monday night the fight between Amber Rose and Khloe Kardashian got even worse when Amber called the Kardashian family a bunch of "plastic h*es" -- and then proceeded to slam the reality TV starlet for having Simpson as a father!

Amber wrote:
    "Yo @khloekardashian I'm really happy for u and I'm gonna let u finish but I have the best leaked nude… I'm so sick of these plastic ass h--s bullying ppl cuz they got the media outlets on payroll. U think because ur dad was a professional football player that got away with murder ur better than me girl? Haaaaannnnn? I'm done dragging this b-tch. Lesson of the day children please don't try Muva cuz I will humble u."

It all started when Amber appeared on Power 105.1 and slammed 25-year-old rapper Tyga for dating Kylie Jenner, who is just 17. Rose called Jenner a "baby" who "needs to go to bed at seven o'clock." Khloe then retaliated by calling out Amber Rose for previously having worked as a stripper, at which point Amber called Kim Kardashian a "wh*re."

Khloe joked about the Simpson rumors last year on Chelsey Lately, so it appears as though it's something she's dealt with before, but we're not sure how the rest of the Kardashian family is going to handle this feud -- we have a feeling everyone is going to have something to say about it!

In related news, Amber Rose's ex-husband Wiz Khalifa just filed court documents alleging that she's not taking good care of the former couple's one-year-old son Sebastian. Wiz claims Amber often stays out all night, requiring that relatives and staff take over and when she wakes up she only plays with Sebastian for fifteen minutes before wandering off. The rapper adds that "the family dog eats its own feces and then licks Sebastian's face," and that Amber and her mom have screaming matches in front of the little boy. Wiz has not yet filed the documents to alter the custody agreement, but TMZ reports that that's coming, "which is why he's getting relatives and others involved to help him make a case." Hmm, maybe she shouldn't be getting in epic Twitter battles then? Just a thought!

Kim's ex Reggie Bush started following Rose on Twitter almost immediately after the squabble started, and interestingly enough, Khalifa started following Khloe around the same time. The real question is: Whose side are YOU on?!