Britney Spears' collapse due to no, not boozin', but the exhaustion of diligent motherhood, may force her to take a "pay cut" as host of PURE nightclub's recent end-of-year bash. Sources tell the New York Daily News that Spears, who was to fetch, by some accounts, almost a half mil as front person for the fete, instead may "only" pocket 200 thou - enough to, in theory, cover her two kids' college educations. In theory.