CREATE TABLE table_51670 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the Crowd for the Venue of Princes Park?
SELECT "Crowd" FROM table_51670 WHERE "Venue" = 'princes park'
SELECT "Crowd" FROM "table_51670" WHERE "Venue" = 'princes park'