
Some of the theories, Nicole showed Paris's Porno Tape at a Bash. Bad.
Another one, Nicole Got Skinnier than Paris! Stupid!
Now the truth of the matter. Gossip guru of celebrities Janet Charlton tells the real reason.
'Paris invited her best friend Nicole to costar on her new reality show "The Simple Life" a few years back. The first season was a hit! Since the show was doing such a great job, Nicole decided she needed a better salary. But instead of consulting with buddy Paris , she went straight to the top. Paris felt betrayed. Nicole had asked the producers for the same salary as Paris. After all it Paris who started the show! After this Paris did not want to be around Nicole any more. She tried to get Nicole cut from the show. Unfortunately, no such luck. The producers refused because they thought Nicole was the humor of the show and that's why it was so successful. That pissed Paris off. Their feud made the show even more successful. Supposedly, not long ago, Paris was spotted walking out of Nicole's condo. Why?'
It was all a scam! Just like their "reality" show.
Source: fadedyouth