Paris HiltonParis Hilton reportedly calls Britney Spears “Animal” after Britney dumped her as a partying friend.

According to Us Weekly, the two fell out a few weeks ago after Britney called to explain she would have to put a hold on their partying.

A source close to Paris told the magazine: “Britney called Paris and said she had decided not to be seen in public with her ‘for now’. Britney told Paris that it’s not personal.”

But Paris is taking it that way, hence the lack of an invite to Paris’ pre-Christmas party and the new nickname. When asked to explain the name, the source revealed Paris believes Britney just lives by animal instints: “Britney doesn’t think about things before she does them. She just acts out.”