CREATE TABLE table_73782 ("Song" TEXT, "Singer" TEXT, "Co-Singers" TEXT, "Music Director" TEXT, "Lyricist" TEXT, "Co-Stars" TEXT, "Movie/Album" TEXT, "Year" FLOAT, "Additional Info" TEXT)

How many co-singers were there when Parveen Babi co-starred?
SELECT COUNT("Co-Singers") FROM table_73782 WHERE "Co-Stars" = 'Parveen Babi'
SELECT COUNT("Co-Singers") FROM "table_73782" WHERE "Co-Stars" = 'Parveen Babi'