Brandon “Greasy Bear” Davis can’t stop getting into trouble. The hard-partying oil heir managed to annoy a series of guests at a birthday party for Web site NeverWood High’s Carlos Lopez at Beverly Hills’ Bar 210 the other night. “Perhaps he took the party’s ‘American Psycho’ theme a bit too far,” said a witness. “He was being loud and obnoxious, offending everybody.” Guests included Nicky Hilton, Kellan Lutz, Jamie Lynn Sigler, Lance Bass, Stephanie Pratt and Jessica Stroup. At Paris Hilton‘sbirthday party in her Beverly Hills mansion the following night, one spy said he was so disheveled that Paris kept her distance.