So much for friends forever! Brittany Flickinger, who Paris chose as her new gal pal on Paris Hilton's My New BFF, got the cold shoulder at Sundance. Paris was too busy "sucking face" with her new BF, MySpace CEO Chris DeWolfe, the New York Post reports, leaving Brittany to spend all of Sunday "snapping up freebies at the Owl's Lab gifting station" solo. Nabbing swag solo? Boo hoo!

Maybe it's the lack of approval from Paris' real number one BFF, sister Nicky, that did Brittany in. "Nicky can't stand Paris' new BFF," a source tells Page Six. Nicky apparently wouldn't let Paris and Brittany stay at her BF Jeffrey Katzenberg's house with her, so Paris rented a condo and befriended Danity Kane reject Aubrey O'Day. (Yeah, that's taking a step up!) "Paris kept ditching Brittany for Aubrey," the source says, including on Friday night when they abandoned Brittany at a party. And when Brittany finally caught up with them at 2 a.m., she was wailing, "Paris, stop leaving me!" Ouch!