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Paris Hilton is being shunned by her sister Nicky.

Nicky is reportedly distancing herself from her sister because she hates Brittany Flickinger, the winner of Paris' reality TV show 'My New BFF'.

The feud is believed to have reached new heights last week, when Nicky banned Paris from staying at Dreamworks CEO Jeffrey Katzenberg's house during the Sundance Film Festival in Utah.

Paris and Brittany had to rent their own apartment, but the heiress soon grew tired of Brittany, choosing to party with former Danity Kane singer Aubrey O'Day.

The source added: "Paris kept ditching Brittany for Aubrey".

The situation came to a head in the early hours of Saturday morning (17.01.09), when Brittany spotted Paris and Aubrey having fun at exclusive bar Tao.

The source adds: "Brittany was crying and screaming 'Paris, stop leaving me!' "

But her pleading didn't work - Paris spent the next day with MySpace CEO Chris DeWolfe at the MySpace Cafe while Brittany wandered around town by herself.

The 27-year-old heiress - who recently claimed she has been single since splitting with Good Charlotte rocker Benji Madden - and DeWolfe were later seen "grinding" and "sucking face" on the dance floor at Tao.