CREATE TABLE table_23294081_11 (_number INT, performer_2 VARCHAR, us_viewers__millions_ VARCHAR)

What's the number of the episode seen by 2.99 millions of people in the US, where performer 2 was Heather Anne Campbell?
SELECT MIN(_number) FROM table_23294081_11 WHERE performer_2 = "Heather Anne Campbell" AND us_viewers__millions_ = "2.99"
SELECT MIN("_number") FROM "table_23294081_11" WHERE "2.99" = "us_viewers__millions_" AND "Heather Anne Campbell" = "performer_2"