Britney Spears’ Cirus Concert Comeback tour has been confirmed a huge success. Pollstar magazing which tracks concert box office gross receipts was the hightest grossing North American tour for the first half of 2009. Britney’s 37 concerts in 30 cities sold 20,498 tickets per show at an average price of $99.29 for a total gross of $61.1 million. Britney will return to the US for more sold out concerts in August.