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LOS ANGELES (Hollywood Reporter) - " Mamma Mia !" replaced " The Dark Knight " as the top-selling DVD in the United States, according to Nielsen VideoScan data issued Wednesday.

The Batman sequel , released December 9 , remains the top-selling video release of the year, with an estimated worldwide total of 13.5 million units sold its first week out, 1.7 million of them on the nascent Blu-ray Disc format .

On trade publication Home Media Magazine 's rental chart, top honors went to " The Mummy: Tomb of the Dragon Emperor ," which also bumped "The Dark Knight" to No. 2. "Mamma Mia!" debuted at No. 3.

" Dark Knight " remained the No. 1 Blu-ray Disc seller for the second week, according to Nielsen VideoScan . " The Mummy " debuted at No. 2, with "Mamma Mia!" at No. 3.

Reuters/Hollywood Reporter