The installment, in which series regulars Stan and Kyle have to get Spears to the North Pole, is to air Wednesday, the television network said.

"Britney Spears is trying to get away from it all in the mountains near South Park, Colo., when the boys have a run-in with her. Stan and Kyle get caught up in Britney's celebrity and the never-ending feeding frenzy that follows her wherever she goes," said a news release describing the episode.