Doors were not opening for reality stars at Sundance. When Stephanie Pratt of “The Hills”arrived at Tao at The Lift at 3 a.m. Sunday with a big entourage, “she was told only two of her guests could join her,” a spy said. “She created a scene at the door and was told to go in or be booted. She went inside pouting with two friends, leaving the rest outside.” A rep for Pratt said, “She was with her best friend. She was enjoying herself.” Also left in the cold was Jon Gosselin, with a new girlfriend. We’re told, “He waited on line freezing for 20 minutes but actually seemed pretty relaxed about it.” Inside were Jon Hamm, Amber Tamblyn, Jared Leto and Ron Burkle.