The insta-BFFship that transfixed America has ended: Sources tell the New York Post's Page Six that Britney Spears has declared Paris Hilton persona non grata (Latin for "really bad news"), and hasn't hopped a single club (no, not a euphemism) with the celebutante in ages (OK, like, a week). Says the snitch, "Britney has been told that if she ever wants a comeback, she has to stay far away from Paris and start acting like an adult [who wears panties]." (My brackets.)