Paris Hilton parisbrittanybreakup.jpg

Apparently Paris' new bestie has caused a rift with her sister, Nicky, who "can't stand" Brittany Flickinger, the winner of Paris' MTV reality show.

According to Page Six, Nicky refused to allow Princess P to stay at her beau David's Sundance house with the offending friend, forcing Paris to rent her own condo.

But Nicky's dislike of Brittany must be getting to Paris...because after being practically inseparable here in LA and in Aspen for Christmas, Paris has been ditching Brittany all over Sundance, for none other than Danity disaster, Aubrey O'Day!

A spy tells P6:

    "Paris kept ditching Brittany for Aubrey. She [Brittany] was crying and screaming, 'Paris, stop leaving me!' "


I guess that's why we caught Paris beating a hasty exit from the MySpace Cafe and then the Brittster all alone at Sundance yesterday: