SELECT MIN("#") FROM table_25933 WHERE "Performer 2" = 'Heather Anne Campbell' AND "U.S. viewers (millions)" = '2.99'
What's the number of the episode seen by 2.99 millions of people in the US, where performer 2 was Heather Anne Campbell?
CREATE TABLE table_25933 (
    "No." real,
    "#" real,
    "Original airdate" text,
    "Performer 1" text,
    "Performer 2" text,
    "Performer 3" text,
    "Performer 4" text,
    "U.S. viewers (millions)" text
)