is working hard to promote the new season of "Keeping Up With The Kardashians." The National ENQUIRER
has already covered how she's showing off her post-baby bod
. But now things have gotten ugly with the reality show diva picking up publicity by going to social media to show off a vintage choker from 1988. In a tragic twist, Kim boasts that it was a gift to momager Kris Jenner
from Nicole Brown Simpson
— who was viciously betrayed by the Kardashians after her murder in 1994!