CREATE TABLE table_6451 ("Birth" TEXT, "Marriage" TEXT, "Became Duchess" TEXT, "Ceased to be Duchess" TEXT, "Death" TEXT, "Spouse" TEXT)

Who is The Spouse of the Duchess that has a Became Duchess on 31 october 1733 husband's accession?
SELECT "Spouse" FROM table_6451 WHERE "Became Duchess" = '31 october 1733 husband''s accession'
SELECT "Spouse" FROM "table_6451" WHERE "Became Duchess" = '31 october 1733 husband\'s accession'