CREATE TABLE table_16979 ("Total No." FLOAT, "Celebrity" TEXT, "Director" TEXT, "Original air date" TEXT, "Viewers" TEXT)

How many celebrities had an 18October2007 Original air Date?
SELECT COUNT("Celebrity") FROM table_16979 WHERE "Original air date" = '18October2007'
SELECT COUNT("Celebrity") FROM "table_16979" WHERE "Original air date" = '18October2007'