CREATE TABLE table_20449 ("Country" TEXT, "Name" TEXT, "Host" TEXT, "Channel" TEXT, "First Premiere" TEXT, "Regular Judge" TEXT, "Seasons" FLOAT)

Name the host when first premiere is august 3, 2007
SELECT "Host" FROM table_20449 WHERE "First Premiere" = 'August 3, 2007'
SELECT "Host" FROM "table_20449" WHERE "First Premiere" = 'August 3, 2007'