IT'S OFFICIAL: US WEEKLY MAG TO CLAIM JESSICA SIMPSON AND NICK LACHEY SPLIT, SAY REPS... DEVELOPING...FLASH: NBCNEWS CUTS STAFF ON EVE OF HOLIDAY: LAYOFFS EARLIER IN WEEK, SAYS SOURCE. AT LEAST 15 STAFFERS CUT FROM 'DATELINE', CUTS REACHED CNBC FOREIGN BUREAUS... DEVELOPING...